Laurent Bussard Elisabetta Di Nitto Anna Nano Olivier Nano Gianluca Ripa An Approach to Identity Management for Service Centric Systems. 254-265 2008 ServiceWave http://dx.doi.org/10.1007/978-3-540-89897-9_22 conf/servicewave/2008 db/conf/servicewave/servicewave2008.html#BussardNNNR08