References
C. Goebel:An elementary particle of zero four-momentum;a genuine spurion, University of Wisconsin, preprint (1960).
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Leader, E. The « photon-spurion » and dispersion theory. Nuovo Cim 22, 1324–1325 (1961). https://doi.org/10.1007/BF02786910
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DOI: https://doi.org/10.1007/BF02786910