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Scientific-Research Institute of Nuclear Physics; Moscow State University. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 47, No. 1, pp. 140–143, April, 1981.
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Smirnov, V.A. Singularities of feynman amplitudes in the momentum space. Theor Math Phys 47, 369–371 (1981). https://doi.org/10.1007/BF01017029
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DOI: https://doi.org/10.1007/BF01017029