Martin Henkel Erik Perjons Jelena Zdravkovic Christer Domeij Gunnar Appehl A Value-Based Foundation for Service Modelling. 129-137 2006 conf/ecows/2006 ECOWS http://doi.ieeecomputersociety.org/10.1109/ECOWS.2006.4 db/conf/ecows/ecows2006.html#HenkelPZDA06