Patrick Maillé Maurizio Naldi Bruno Tuffin Understanding and Preventing Tacit Collusion among Telecommunication Operators. 249-263 2009 NET-COOP http://dx.doi.org/10.1007/978-3-642-10406-0_17 conf/netcoop/2009 db/conf/netcoop/netcoop2009.html#MailleNT09