Bozhevolnyi, Sergey I.Vohnsen, Brian2004-12-032004-12-0320012001http://hdl.handle.net/2003/199210.17877/DE290R-4782enThe American Physical SocietyPhysical Review Letters530Publisher's Note: Comment on "Local Observations of Phase Singularities in Optical Fields in Waveguide Structures"10.1103/PhysRevLett.87.269901article (journal)