H. Kwak, C. Lee, H. Park, and S. Moon. Proceedings of the 19th International Conference on World Wide Web, page 591--600. New York, NY, USA, ACM, (2010)
O. Abdul Rahman, A. Kluth, and A. Schatz. Capturing Value in International Manufacturing and Supply Networks : New models for a changing world; 20 and 21 September 2012, M�ller Centre, Cambridge; Symposium proceedings. The 16th Cambridge International Manufacturing Symposium, page 14. Cambridge, UK, University of Cambridge Cambridge, UK / Institute for Manufacturing, (2012)