Physical Review LettersExtension of a Theorem of StreaterN. H. FuchsPublished Dec 13, 1965• 3 citationsPublisherAbstractReceived 29 October 1965DOI:https://doi.org/10.1103/PhysRevLett.15.911©1965 American Physical SocietyDOI10.1103/physrevlett.15.911