Elisa Bertino Anna Cinzia Squicciarini D. Mevi A Fine-Grained Access Control Model for Web Services. 33-40 2004 conf/IEEEscc/2004 IEEE SCC http://csdl.computer.org/comp/proceedings/scc/2004/2225/00/22250033abs.htm db/conf/IEEEscc/scc2004.html#BertinoSM04