| http://www.w3.org/ns/prov#value | - This paper was written while the author was a guest at the Latin American Summer School of Physics, Centro Brasileiro de Pesquisas Fisicas, Rio de Janiero, June 27-August 7, 1960.Record Number:CaltechAUTHORS:FRApr60aPersistent URL:http://resolver.caltech.edu/CaltechAUTHORS:FRApr60aAlternative URL:http://dx.doi.org/10.1103/PhysRevLett.5.159Usage Policy:No commercial reproduction, distribution, disp
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