Anderson, P. W.Ho, Chang-MingMuthukumar, V. N.Ogata, Masao2004-12-102004-12-1020012001http://hdl.handle.net/2003/1844510.17877/DE290R-16091enThe American Physical SocietyPhysical Review Letters530Nature of Spin Excitations in Two-Dimensional Mott Insulators: Undoped Cuprates and Other Materials10.1103/PhysRevLett.86.1626article (journal)