Giuseppe Damiano Ester Giallonardo Eugenio Zimeo onQoS-QL: A Query Language for QoS-Based Service Selection and Ranking. 115-127 2007 ICSOC Workshops http://dx.doi.org/10.1007/978-3-540-93851-4_12 conf/icsoc/2007w db/conf/icsoc/icsoc2007w.html#DamianoGZ07