Fodor, Z.Katz, S. D.2004-12-272004-12-2720012001http://hdl.handle.net/2003/1938410.17877/DE290R-2471enThe American Physical SocietyPhysical Review Letters530Grand Unification Signal from Ultrahigh Energy Cosmic Rays?10.1103/PhysRevLett.86.3224article (journal)