S. Schöne, A. Michalski, and J. Lienhard. Proceedings of the International Symposium of the International Association of Shell and Spatial Structures (IASS) , Spatial Structures Temporary and Permanent, Shanghai, China, (2010)
J. Lienhard, and J. Knippers. Conference Proceedings of the International BIONA-Symposium: Biomimetics in Architecture: Evolutionary constructions and design, page 15. ITKE, Universität Stuttgart, (November 2009)