Ley, L.Maier, F.Mantel, B.Riedel, M.Ristein, J.2004-12-032004-12-0320012001http://hdl.handle.net/2003/164110.17877/DE290R-12062enThe American Physical SocietyPhysical Review Letters53010.1103/PhysRevLett.87.209706article (journal)