Chikkatur, A. P.Gupta, S.Görlitz, A.Inouye, S.Rosenband, T.2004-12-032004-12-0320012001http://hdl.handle.net/2003/82810.17877/DE290R-3722enThe American Physical SocietyPhysical Review Letters530Observation of Vortex Phase Singularities in Bose-Einstein Condensates10.1103/PhysRevLett.87.080402article (journal)