Kawamura, HikaruLi, Mai SuanNordblad, Per2004-12-102004-12-1020012001http://hdl.handle.net/2003/1836110.17877/DE290R-12507enThe American Physical SocietyPhysical Review Letters530Aging Effect in Ceramic Superconductors10.1103/PhysRevLett.86.1339article (journal)