@inproceedings {MCM-SCI03, title = {A Pattern Based Approach to Model Software Performance Using UML and Petri Nets: Application to Agent Based Systems}, volume = {9}, year = {2003}, month = {7}, pages = {307-313}, publisher = {IIIS Press}, organization = {IIIS Press}, author = {Jos{\'e} Merseguer and J. Campos and E. Mena} }