Mohammadreza Rahmatpour Vahid Tabataba Vakili Optimum Resource Allocation for Amplify-and-Forward Cooperative Networks with Differential Modulation. 88-100 2008 NEW2AN http://dx.doi.org/10.1007/978-3-540-85500-2_8 conf/new2an/2008 db/conf/new2an/new2an2008.html#RahmatpourV08