Massimo Tornatore Simone Ceresa Paolo Giacomazzi A novel statistical model of users' behavior in key distribution schemes. 641-648 2007 BROADNETS http://dx.doi.org/10.1109/BROADNETS.2007.4550494 conf/broadnets/2007 db/conf/broadnets/broadnets2007.html#TornatoreCG07