Emilio Leonardi Marco Mellia Fabio Neri Marco Ajmone Marsan On the stability of input-queued switches with speed-up. 104-118 2001 9 IEEE/ACM Trans. Netw. 1 http://portal.acm.org/citation.cfm?id=365401.365410 db/journals/ton/ton9.html#LeonardiMNM01