Svane, A.Szotek, Z.Temmerman, W. M.Winter, H.2004-12-142004-12-1420012001http://hdl.handle.net/2003/1865510.17877/DE290R-6391enThe American Physical SocietyPhysical Review Letters530Cu Valency Change Induced by O Doping in YBCO10.1103/PhysRevLett.86.2435article (journal)