Bose, S.Fuentes-Guridi, I.Knight, P. L.Vedral, V.2004-12-032004-12-0320012001http://hdl.handle.net/2003/64110.17877/DE290R-10484enThe American Physical SocietyPhysical Review Letters530Subsystem Purity as an Enforcer of Entanglement10.1103/PhysRevLett.87.050401article (journal)