Jan Willemson Arne Ansper A Secure and Scalable Infrastructure for Inter-Organizational Data Exchange and eGovernment Applications. 572-577 2008 ARES http://doi.ieeecomputersociety.org/10.1109/ARES.2008.90 conf/IEEEares/2008 db/conf/IEEEares/ares2008.html#WillemsonA08