Valeria Cardellini Emiliano Casalicchio Vincenzo Grassi Francesco Lo Presti Efficient provisioning of service level agreements for service oriented applications. 29-35 2007 IW-SOSWE http://doi.acm.org/10.1145/1294928.1294936 conf/sigsoft/2007soswe db/conf/sigsoft/soswe2007.html#CardelliniCGP07