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Additional information
Moscow State University. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 5, No. 1, pp. 3–9, October, 1970.
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Kiperman, V.A. Criterion for a certain canonical Fermi transformation to be proper. Theor Math Phys 5, 937–941 (1970). https://doi.org/10.1007/BF01035974
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DOI: https://doi.org/10.1007/BF01035974