{ "types" : { "Bookmark" : { "pluralLabel" : "Bookmarks" }, "Publication" : { "pluralLabel" : "Publications" }, "GoldStandardPublication" : { "pluralLabel" : "GoldStandardPublications" }, "GoldStandardBookmark" : { "pluralLabel" : "GoldStandardBookmarks" }, "Tag" : { "pluralLabel" : "Tags" }, "User" : { "pluralLabel" : "Users" }, "Group" : { "pluralLabel" : "Groups" }, "Sphere" : { "pluralLabel" : "Spheres" } }, "properties" : { "count" : { "valueType" : "number" }, "date" : { "valueType" : "date" }, "changeDate" : { "valueType" : "date" }, "url" : { "valueType" : "url" }, "id" : { "valueType" : "url" }, "tags" : { "valueType" : "item" }, "user" : { "valueType" : "item" } }, "items" : [ { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/23138337d3d8fd284572e1e451dd8559a/petraheim", "tags" : [ "2024","Spyridonos","active-bending","architecture","biocomposites","biomat","dahy","development","fibre","geometrical","gil","guo","itke","lightweight","natural","profiles","pultruded","structural","structure" ], "intraHash" : "3138337d3d8fd284572e1e451dd8559a", "interHash" : "15969ababec81e51ccd2f5e2e641b1dc", "label" : "Geometrical and Structural Design Development of an Active-Bending Structure from Natural Fibre Pultruded Profiles: The LightPRO Shell", "user" : "petraheim", "description" : "", "date" : "2024-11-25 11:38:18", "changeDate" : "2024-11-25 11:38:18", "count" : 2, "pub-type": "article", "journal": "Developments in the Built Environment","publisher":"Elsevier", "year": "2024", "url": "", "author": [ "Evgenia Spyridonos","Yanan Guo","Marta Gil Pérez","Hanaa Dahy" ], "authors": [ {"first" : "Evgenia", "last" : "Spyridonos"}, {"first" : "Yanan", "last" : "Guo"}, {"first" : "Marta", "last" : "Gil Pérez"}, {"first" : "Hanaa", "last" : "Dahy"} ], "volume": "20","pages": "100577","abstract": "The utilisation of bio-based materials has significantly increased in recent years, driven by a growing awareness of environmentally friendly alternatives in the construction industry. This study introduces innovative natural fibre pultruded profiles for load-bearing applications in structural systems. By employing pultrusion technology with flax fibres and customised plant-based matrix, linear and unidirectional biocomposite profiles were developed. These profiles were used in the creation of LightPRO Shell, an active-bending structure combining biocomposite profiles with a membrane outer skin, demonstrating their mechanical properties and suitability for such applications. The paper focuses on the geometrical and structural design development of the structure employing computational design tools for optimisation, ensuring design parameters and performance requirements were met. The final structure, a 10-m span doubly curved gridshell, features a continuous perimeter beam and consists of 44 profiles ranging from 6 to 12.5 m, showcasing the potential of natural fibre biocomposites as sustainable alternatives in construction.", "language" : "eng", "issn" : "2666-1659", "doi" : "https://doi.org/10.1016/j.dibe.2024.100577", "bibtexKey": "spyridonos2024geometrical" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/29f2e6030f8d4fecb31fd62276685e4f3/petraheim", "tags" : [ "2022","comparision","conceptual","development","engineering","itke","knippers","krtschil","menges","orozco","slab","supported","system","timber","wagner" ], "intraHash" : "9f2e6030f8d4fecb31fd62276685e4f3", "interHash" : "0b78df4856c24f3532305f84905a5d25", "label" : "Conceptual development and comparison of two punctually supported timber slab systems", "user" : "petraheim", "description" : "", "date" : "2024-01-10 12:10:00", "changeDate" : "2024-01-10 12:10:00", "count" : 7, "pub-type": "inproceedings", "booktitle": "9. Doktorandenkolloquium Holzbau Forschung + Praxis 2022", "year": "2022", "url": "", "author": [ "Anna Krtschil","Luis Orozco","Hans Jakob Wagner","Achim Menges","Jan Knippers" ], "authors": [ {"first" : "Anna", "last" : "Krtschil"}, {"first" : "Luis", "last" : "Orozco"}, {"first" : "Hans Jakob", "last" : "Wagner"}, {"first" : "Achim", "last" : "Menges"}, {"first" : "Jan", "last" : "Knippers"} ], "abstract": "The goal of this ongoing research is the development of a novel, digital, modular wood building system, which allows for open-plan, flexible spaces and bespoke architectural solutions. This paper presents a comparison of two new timber building systems for multi-storey construction. The building systems, one solid and one hollow, are developed using an integrative approach that considers structural, fabrication and assembly requirements in the system design process.", "language" : "eng", "bibtexKey": "Krtschil.2022" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/201b69a6f520d1f671fd27c3bdbbba0fd/petraheim", "tags" : [ "2022","amtsberg","bechert","building","chen","connections","construction","design","development","engineering","itke","knippers","krtschil","menges","multi-storey","orozco","shah","structural","timber","wagner" ], "intraHash" : "01b69a6f520d1f671fd27c3bdbbba0fd", "interHash" : "8f377bd13546b30c8600eb5b63dc8abe", "label" : "Structural development of a novel punctually supported timber\r\nbuilding system for multi-storey construction", "user" : "petraheim", "description" : "", "date" : "2023-01-17 12:47:48", "changeDate" : "2023-01-25 13:57:05", "count" : 9, "pub-type": "article", "journal": "Journal of Building Engineering", "year": "2022", "url": "", "author": [ "Anna Krtschil","Luis Orozco","Simon Bechert","Hans Jakob Wagner","Felix Amtsberg","Tzu-Ying Chen","Anand Shah","Achim Menges","Jan Knippers" ], "authors": [ {"first" : "Anna", "last" : "Krtschil"}, {"first" : "Luis", "last" : "Orozco"}, {"first" : "Simon", "last" : "Bechert"}, {"first" : "Hans Jakob", "last" : "Wagner"}, {"first" : "Felix", "last" : "Amtsberg"}, {"first" : "Tzu-Ying", "last" : "Chen"}, {"first" : "Anand", "last" : "Shah"}, {"first" : "Achim", "last" : "Menges"}, {"first" : "Jan", "last" : "Knippers"} ], "volume": "58","pages": "104972","abstract": "Though capable of allowing multi-directional spans, timber products such as cross-laminated timber are primarily utilized uni-directionally using linear supports like walls or beam elements. Recent building designs increasingly show punctual supports but with narrow column grid layouts.\r\nSupport beams and narrow grids limit the design space for multi-storey timber buildings. To overcome these design limits, an integrative design concept for punctually supported timber slabs is being developed that allows for large spans and irregular column layouts. Therefore, engineering methods are integrated in the architectural design of the building components, such as plates, columns, and their connections. The developed slab system combines hardwood and softwood materials in a sandwich construction. The plates have a tailored internal topology considering the force flow in the slab. A plate-to-plate connection design is evaluated through\r\nmechanical tests, which also serve as calibration for the global structural model. The research findings are validated through the design and construction of a large scale demonstrator: the ITECH Campus Lab.", "language" : "eng", "doi" : "https://doi.org/10.1016/j.jobe.2022.104972", "bibtexKey": "krtschil2022structural" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2d4890b289f875102a2dc00e2b3ff3473/petraheim", "tags" : [ "2021","Duque","Estrada","Zechmeister","application","architecture","biennale","building","dambrosio","design","development","fibre","frp","frp-timber","hybrid","itke","kannenberg","knippers","maison","menges","multi-story","rinderspacher","schlopschnat","system","venice" ], "intraHash" : "d4890b289f875102a2dc00e2b3ff3473", "interHash" : "eee2c64b40dcd21bef80c235c75da6d5", "label" : "Design and development of an FRP-Timber hybrid building system for multi-story applications in architecture: Maison Fibre", "user" : "petraheim", "description" : "", "date" : "2022-01-27 15:01:46", "changeDate" : "2022-01-27 14:01:46", "count" : 2, "pub-type": "inproceedings", "booktitle": "Proceedings of the ACADIA Conference 2021", "year": "2021", "url": "", "author": [ "Niccolo Dambrosio","Christoph Zechmeister","Rebeca Duque Estrada","Fabian Kannenberg","Marta Gil Pérez","Christoph Schlopschnat","Katja Rinderspacher","Jan Knippers","Achim Menges" ], "authors": [ {"first" : "Niccolo", "last" : "Dambrosio"}, {"first" : "Christoph", "last" : "Zechmeister"}, {"first" : "Rebeca", "last" : "Duque Estrada"}, {"first" : "Fabian", "last" : "Kannenberg"}, {"first" : "Marta", "last" : "Gil Pérez"}, {"first" : "Christoph", "last" : "Schlopschnat"}, {"first" : "Katja", "last" : "Rinderspacher"}, {"first" : "Jan", "last" : "Knippers"}, {"first" : "Achim", "last" : "Menges"} ], "language" : "eng", "bibtexKey": "dambrosio2021design" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2733c68c9e962126b8a0255eef1686d46/petraheim", "tags" : [ "2021","application","architecture","biocomposite","biomat","dahy","development","fibre-reinforced","flexible","free-form","geometies","itke","load-bearing","material","natural","nfrp","structures","sustainable" ], "intraHash" : "733c68c9e962126b8a0255eef1686d46", "interHash" : "575f5cbe43d8c8e3dddd050c956809c8", "label" : "Towards sustainable buildings with free-form geometries: Development and Application of flexible NFRP in load-bearing structures", "user" : "petraheim", "description" : "", "date" : "2021-07-16 12:43:10", "changeDate" : "2021-07-16 10:43:10", "count" : 5, "pub-type": "inbook", "booktitle": "Biocomposite Materials: Design and Mechanical Properties Characterization","publisher":"Springer Nature","address":"Singapore", "year": "2021", "url": "", "author": [ "Hanaa Dahy" ], "authors": [ {"first" : "Hanaa", "last" : "Dahy"} ], "editor": [ "M. T. H. Sultan","M. Shuky A. Majid","A. Iskandar A.","M. R. M. Jamir","N. Saba" ], "editors": [ {"first" : "M. T. H.", "last" : "Sultan"}, {"first" : "M.", "last" : "Shuky A. Majid"}, {"first" : "A.", "last" : "Iskandar A."}, {"first" : "M. R. M.", "last" : "Jamir"}, {"first" : "N.", "last" : "Saba"} ], "pages": "31-43","abstract": "The application of non-renewable building materials including concrete and metals in construction industries have caused a major impact on the environment including the destruction of more than 45% of the global resources, the consumption of 35% of energy and nearly 40% of energy-related emissions (UN Secretary-General\u2019s High-Level Panel on Global 2012). In order to help in reducing these extending impacts, the building sector started considering three reduction of these dreadful impacts through increasing the environmentally-friendly building materials with Natural Fiber Reinforced Polymer Composites (NFRP), specially through WPCs (Wood Polymer Composites) since the 90s. The use of natural fibers in composites form in the building sector is historically applied since the phrase time when straw and mud were mixed to form the first known bricks in history. After the discovery of cement, it became the largest dominant material in the industry till our current time, in spite of its huge environmental damage. Natural fibres (NF) have been mostly applied in non-structural applications. Accordingly, this paper discusses applying reinforcement scenarios in the form of novel core and veneer reinforcement to enhance a load-bearing capacity to reach to improved mechanical properties that could enable building a demo- shell construction system. In this research natural fiber reinforced polymer composite (NFRP) produced from agricultural residues in the form of straw fibres (SF) mixed with three different types of polymers including (polylactide (PLA), a TPE (Thermoplastic elastic polymer) and high-density polyethylene (HDPE)) were developed through extrusion processes, then laminated or veneered to elevate the material properties needed to be reached to apply in load-bearing structures. The thermoplastic elastic polymers (TPE) were applied to enhance elasticity and flexibility in reaching sophisticated geometries. The mechanical strength was controlled by veneering. The targeted and reached material properties were applied in structural simulations that were later used in predicting the structural performance of a physical experimental shell construction that were built to validate the settled hypothesis of reinforcement of elastic/semi-elastic lignocellulosic cores to be applied in load-bearing systems. The paper will highlight the material samples development and testing, followed by an analysis and interpretation to the possibility of usage and appliance in load-bearing structures. Finally, the physical built demonstrator in the form of the experimental shell construction is shortly illustrated to showcase the validity of the settled hypothesis.", "isbn" : "978-981-33-4090-9", "language" : "eng", "doi" : "https://doi.org/10.1007/978-981-33-4091-6_2", "bibtexKey": "dahy2021towards" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/205ea661ca5d98eb5e1c19be2d9d7cb52/petraheim", "tags" : [ "barrel","design","development","engineering","fabric","gil","itke","kang","kim","membrane","seoul","shaped","structures","vault" ], "intraHash" : "05ea661ca5d98eb5e1c19be2d9d7cb52", "interHash" : "c92d2c168ba5de26fa7bffa3e3760f75", "label" : "Development of design aid for barrel vault shaped membrane fabric structures", "user" : "petraheim", "description" : "", "date" : "2020-12-10 09:31:23", "changeDate" : "2020-12-11 13:22:48", "count" : 3, "pub-type": "article", "journal": "Journal of Structural Integrity and Maintenance","publisher":"Taylor & Francis", "year": "2017", "url": "", "author": [ "Marta Gil Pérez","Seung Deog Kim","Thomas H-K Kang" ], "authors": [ {"first" : "Marta", "last" : "Gil Pérez"}, {"first" : "Seung Deog", "last" : "Kim"}, {"first" : "Thomas H-K", "last" : "Kang"} ], "volume": "2","number": "1","pages": "12--21","abstract": "This study introduces the development of membrane fabric structures as well as the procedure for their design and analysis along with an explanation of the finite element modeling and conditions considered. In addition, a parametric study on regular barrel vault shaped membranes supported between arches is conducted. The following three parameters determine the geometry of this type of membranes: the arch curvature, the width of the panel, and the scale of the arch. Considering these three parameters and the different combinations among them, regular membrane panels are analyzed leading to the development of a design aid for this type of membranes.", "doi" : "10.1080/24705314.2017.1280592", "bibtexKey": "gil2017development" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/29470bf93ca131f02876a99d3b394aebf/petraheim", "tags" : [ "2019","Baszynski","Habraken","biobased","biocomposite","biomat","bos","curved","dahy","development","double","element","erection","fabrication","itke","pavilion","petrs","segmented","shell","teuffel" ], "intraHash" : "9470bf93ca131f02876a99d3b394aebf", "interHash" : "db57be918529b3fd4242a5e43df0f5b6", "label" : "BioMat Pavilion 2018: Development, Fabrication, and Erection of a Double Curved Segmented Shell from Biocomposite Elements", "user" : "petraheim", "description" : "", "date" : "2020-05-20 15:05:58", "changeDate" : "2021-07-01 13:11:34", "count" : 2, "pub-type": "inproceedings", "booktitle": "Proceedings of IASS Annual Symposium 2019 \u2013 Structural Membranes 2019 Form and Force","address":"Barcelona, Spain", "year": "2019", "url": "", "author": [ "Hanaa Dahy","Jan Petrs","D.H. Bos","Piotr Baszynski","P. H.W. Habraken","Pattrick M. Teuffel" ], "authors": [ {"first" : "Hanaa", "last" : "Dahy"}, {"first" : "Jan", "last" : "Petrs"}, {"first" : "D.H.", "last" : "Bos"}, {"first" : "Piotr", "last" : "Baszynski"}, {"first" : "P. H.W.", "last" : "Habraken"}, {"first" : "Pattrick M.", "last" : "Teuffel"} ], "language" : "eng", "bibtexKey": "dahy2019biomat" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/23deeb5503876f4dd0bc18ac935a3d134/petraheim", "tags" : [ "2019","architecture","baszynski","biobased","biocomposite","biomat","construction","dahy","design","development","erection","experimental","itke","material","pavilion","petrs","segmented","shell" ], "intraHash" : "3deeb5503876f4dd0bc18ac935a3d134", "interHash" : "24dbb6b5e98ad35d0d91085c5c1b55d2", "label" : "Experimental Biocomposite Pavilion: Segmented Shell Construction - Design, Material Development, and Erection", "user" : "petraheim", "description" : "", "date" : "2020-05-20 14:20:56", "changeDate" : "2020-06-02 10:07:21", "count" : 4, "pub-type": "inproceedings", "booktitle": "Proceedings of ACADIA 2019: the 39th Annual Conference of the Association for Computer Aided Design in Architecture","address":"Austin, Texas, USA", "year": "2019", "url": "", "author": [ "Hanaa Dahy","Piotr Baszynski","Jan Petrs" ], "authors": [ {"first" : "Hanaa", "last" : "Dahy"}, {"first" : "Piotr", "last" : "Baszynski"}, {"first" : "Jan", "last" : "Petrs"} ], "language" : "eng", "bibtexKey": "dahy2019experimental" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2a7eba34a8cd3dafd5f60570830f112c7/petraheim", "tags" : [ "2018","active-geometric","advances","computational","development","framework","iguana","itke","knippers","körner","lightweight","modeling","modelling","robust","structure","suzuki","toplogic" ], "intraHash" : "a7eba34a8cd3dafd5f60570830f112c7", "interHash" : "dd1e7d64484aba9d5497091bd986eedf", "label" : "Iguana: Advances on the development of a robust computational framework for active-geometric and -topologic modeling of lightweight structures", "user" : "petraheim", "description" : "", "date" : "2020-05-20 13:44:21", "changeDate" : "2020-06-02 10:07:21", "count" : 2, "pub-type": "inproceedings", "booktitle": "Proceedings of the IASS Annual Symposium 2018","address":"Boston, USA", "year": "2018", "url": "", "author": [ "Seiichi Suzuki","Axel Körner","Jan Knippers" ], "authors": [ {"first" : "Seiichi", "last" : "Suzuki"}, {"first" : "Axel", "last" : "Körner"}, {"first" : "Jan", "last" : "Knippers"} ], "language" : "eng", "bibtexKey": "suzuki2018iguana" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2270d64527545f5f1c51d0a760c5b6789/petraheim", "tags" : [ "2012","architecture","cable","development","engineering","gabler","itke","knippers","net","structure","tensile","waimer" ], "intraHash" : "270d64527545f5f1c51d0a760c5b6789", "interHash" : "b2bd7eae3391434e23149edaed35fdd8", "label" : "New developments for tensile cable net structures", "user" : "petraheim", "description" : "", "date" : "2020-05-18 11:16:25", "changeDate" : "2020-06-02 10:10:17", "count" : 3, "pub-type": "inproceedings", "booktitle": "Proceedings of the International IASS Symposium","address":"Seoul, Korea", "year": "2012", "url": "", "author": [ "Frédéric Waimer","Markus Gabler","Jan Knippers" ], "authors": [ {"first" : "Frédéric", "last" : "Waimer"}, {"first" : "Markus", "last" : "Gabler"}, {"first" : "Jan", "last" : "Knippers"} ], "editor": [ "International Association for Shell","Spatial Structures" ], "editors": [ {"first" : "International Association", "last" : "for Shell"}, {"first" : "Spatial", "last" : "Structures"} ], "language" : "eng", "bibtexKey": "waimer2012developments" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2d35b05e892ce0e5900ecd468eca4b14a/petraheim", "tags" : [ "2009","connecting","connection","development","engineering","hwang","itke","knippers","node","park","spatial","structure","system" ], "intraHash" : "d35b05e892ce0e5900ecd468eca4b14a", "interHash" : "24170be47d84c3166e3dbc2444aa8889", "label" : "Development of node connecting systems used for spatial structures", "user" : "petraheim", "description" : "", "date" : "2020-05-15 15:58:32", "changeDate" : "2020-05-22 12:24:43", "count" : 2, "pub-type": "inproceedings", "booktitle": "Conference proceeding of the 9th Asian Pacific Conference on Shell and Spatial Structures (APCS2009)","address":"Nagoya Japan", "year": "2009", "url": "", "author": [ "Don-U Park","Jan Knippers","Kyung-Ju Hwang" ], "authors": [ {"first" : "Don-U", "last" : "Park"}, {"first" : "Jan", "last" : "Knippers"}, {"first" : "Kyung-Ju", "last" : "Hwang"} ], "pages": "31", "language" : "eng", "bibtexKey": "park2009development" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2b25ce2dacd09ad6531136aff041130e2/petraheim", "tags" : [ "2018","assessment","bio-inspired","biomat","building","concept","dahy","development","gantner","horn","itke","leistner","product","speck","sustainability" ], "intraHash" : "b25ce2dacd09ad6531136aff041130e2", "interHash" : "efdd06de5d92b32d9f51f0e15e2a7004", "label" : "Bio-Inspired Sustainability Assessment for Building Product Development\u2014Concept and Case Study\u201D, Sustainability", "user" : "petraheim", "description" : "", "date" : "2020-05-14 18:21:37", "changeDate" : "2020-06-29 11:53:00", "count" : 2, "pub-type": "article", "journal": "Sustainability, Special Issue \u201CSustainable Construction\u201D", "year": "2018", "url": "", "author": [ "R. Horn","Hanaa Dahy","J Gantner","Olga Speck","P. Leistner" ], "authors": [ {"first" : "R.", "last" : "Horn"}, {"first" : "Hanaa", "last" : "Dahy"}, {"first" : "J", "last" : "Gantner"}, {"first" : "Olga", "last" : "Speck"}, {"first" : "P.", "last" : "Leistner"} ], "volume": "10(1)","number": "130","abstract": "Technological advancement culminating in a globalized economy has brought tremendous improvements for mankind in manifold respects but comes at the cost of alienation from nature. Human activities nowadays are unsustainable and cause severe damage especially in terms of global depletion and destabilization of natural systems but also harm its own social resources.\r\nIn this paper, a sustainability assessment method is developed based on a bio-inspired sustainability framework that has been developed in the project TRR 141-C01 \u201CThe biomimetic promise\u201D. It is aims at regaining the advantages of societal embeddedness in its environment through biological inspiration. The method is developed using a structured approach including requirement specification, description of the inventory models on bio-inspiration and sustainability assessment, creation of a bio-inspired sustainability assessment model and its validation. It is defined as an accompanying assessment for decision support, using a six-fold two-dimensional structure of social, economic and environmental functions and burdens. The method is applied and validated in 6 projects of TRR 141 and its applicability is exemplarily shown by the assessment of \u201CBio-flexi\u201D, a biobased and biodegradable natural fiber reinforced plastic composite for indoor cladding applications. Based on the findings of the application the assessment method itself is proposed to be advanced towards an adaptive structure and a consequent outlook is provided.", "language" : "eng", "doi" : "10.3390/su10010130", "bibtexKey": "horn2018bioinspired" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2a4ae2d8aaf070aa1b9f3e6ca5de9e4f0/petraheim", "tags" : [ "2009","architecture","design","development","glass","glazed","grid","helbig","itke","knippers","peer-reviewed","shell" ], "intraHash" : "a4ae2d8aaf070aa1b9f3e6ca5de9e4f0", "interHash" : "9e73c6954498dac578e7a102e5ca9570", "label" : "Recent Developments in the Design of Glazed Grid Shells", "user" : "petraheim", "description" : "", "date" : "2020-05-13 09:28:11", "changeDate" : "2021-07-01 13:51:22", "count" : 2, "pub-type": "article", "journal": "International Journal of Space Structures", "year": "2009", "url": "", "author": [ "Jan Knippers","Thorsten Helbig" ], "authors": [ {"first" : "Jan", "last" : "Knippers"}, {"first" : "Thorsten", "last" : "Helbig"} ], "editor": [ "Sage Publishing" ], "editors": [ {"first" : "Sage", "last" : "Publishing"} ], "volume": "24","number": "2","pages": "111 \u2013 126", "language" : "eng", "bibtexKey": "knippers2009recent" } ] }