Abstract
Local one-particle approximations are constructed for matrix elements of two local field operators. If one of the fields is a locally conserved current the approximation is extended in such a way that both locality and current conservation are valid in the approximation.
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Völkel, A.H. On local one-particle approximations and locally conserved currents. Commun.Math. Phys. 5, 57–72 (1967). https://doi.org/10.1007/BF01646358
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DOI: https://doi.org/10.1007/BF01646358