Karl Czajkowski Ian T. Foster Carl Kesselman Volker Sander Steven Tuecke SNAP: A Protocol for Negotiating Service Level Agreements and Coordinating Resource Management in Distributed Systems. 153-183 2002 conf/jsspp/2002 JSSPP http://dx.doi.org/10.1007/3-540-36180-4_9 db/conf/jsspp/jsspp2002.html#CzajkowskiFKST02