Shen, Shun-QingZhang, Guang-Ming2004-12-032004-12-0320012001http://hdl.handle.net/2003/128310.17877/DE290R-11084enThe American Physical SocietyPhysical Review Letters530Ordered Valence-Bond States in Symmetric Two-Dimensional Spin-Orbital Systems10.1103/PhysRevLett.87.157201article (journal)