Reference
H. Ekstein:Nuovo Cimento A,54, 305 (1979).
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Epstein, S.T. The canonical momentum is measurable in any gauge. Lett. Nuovo Cimento 29, 193–194 (1980). https://doi.org/10.1007/BF02743310
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DOI: https://doi.org/10.1007/BF02743310