Massimo Bartoletti Pierpaolo Degano Gian Luigi Ferrari Roberto Zunino Types and Effects for Resource Usage Analysis. 32-47 2007 conf/fossacs/2007 FoSSaCS http://dx.doi.org/10.1007/978-3-540-71389-0_4 db/conf/fossacs/fossacs2007.html#BartolettiDFZ07