Alfredo Cuzzocrea Alessandro D'Atri Andrea Gualtieri Amihai Motro Domenico Saccà Grid-VirtuE: A Layered Architecture for Grid Virtual Enterprises. 33-42 2007 conf/ifip8/2007-1 CONFENIS (1) http://dx.doi.org/10.1007/978-0-387-75902-9_4 db/conf/ifip8/confenis2007-1.html#CuzzocreaDGMS07