Francesco Gregoretti Giuliano Laccetti Almerico Murli Gennaro Oliva U. Scafuri MGF: A Grid-Enabled MPI Library with a Delegation Mechanism to Improve Collective Operations. 285-292 2005 conf/pvm/2005 PVM/MPI http://dx.doi.org/10.1007/11557265_38 db/conf/pvm/pvm2005.html#GregorettiLMOS05