Yiyun Shen Markus Miettinen Pirjo Moen Lea Kutvonen Privacy Preservation Approach in Service Ecosystems. 283-292 2011 EDOCW http://doi.ieeecomputersociety.org/10.1109/EDOCW.2011.59 conf/edoc/2011w db/conf/edoc/edoc2011w.html#ShenMMK11