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Nizhnetagil' State Pedagogical Institute. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 80, No. 3, pp. 372–380, September, 1989.
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Zaslavskii, A.I. Behavior of massless feynman integrals near singular points. Theor Math Phys 80, 935–941 (1989). https://doi.org/10.1007/BF01016186
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DOI: https://doi.org/10.1007/BF01016186