Ivan Djordjevic Theodosis Dimitrakos N. Romano Damian Mac Randal Pierluigi Ritrovato Dynamic security perimeters for inter-enterprise service integration. 633-657 2007 23 Future Generation Comp. Syst. 4 http://dx.doi.org/10.1016/j.future.2006.09.009 db/journals/fgcs/fgcs23.html#DjordjevicDRRR07