Halvard Skogsrud Boualem Benatallah Fabio Casati Manh Q. Dinh Trust-Serv: A Lightweight Trust Negotiation Service. 1329-1332 2004 conf/vldb/2004 VLDB http://www.vldb.org/conf/2004/DEMP20.PDF db/conf/vldb/vldb2004.html#SkogsrudBCD04