Carlos Molina-Jiménez Santosh K. Shrivastava Stuart M. Wheater An architecture for negotiation and enforcement of resource usage policies. 1-8 2011 SOCA http://dx.doi.org/10.1109/SOCA.2011.6166218 conf/soca/2011 db/conf/soca/soca2011.html#Molina-JimenezSW11