Köbler, F.; Fähling, J.; Vattai, A. & Leimeister, J. M. (2009), Analysis of value creation by product-service-systems in the German medical engineering industry, in R. Alt; K. P. Fähnrich & B. Franczyk, ed., '1. International Symposium of Service Sciences 2009 (ISSS) 2009' .