@article {MCM-WINET03, title = {Analysing Internet Software Retrieval Systems: Modeling and Performance Comparison}, journal = {Wireless Networks: The Journal of Mobile Communication Computation and Information}, volume = {9}, year = {2003}, month = {5}, pages = {223-238}, publisher = {Kluwer Academic Publishers}, author = {Jos{\'e} Merseguer and J. Campos and E. Mena} }