Jiacun Wang William M. Tepfenhart Daniela Rosca Anni Tsai Resource-Constrained Workflow Modeling. 171-177 2007 conf/tase/2007 TASE http://doi.ieeecomputersociety.org/10.1109/TASE.2007.42 db/conf/tase/tase2007.html#WangTRT07