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Joint Institute for Nuclear Research, Dubna. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 89, No. 2, pp. 228–237, November, 1991.
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Boikova, N.A., Dvoeglazov, V.V. & Tyukhtyaev, Y.N. Quasipotential in the fourth order of perturbation theory and infrared singularities. Theor Math Phys 89, 1174–1181 (1991). https://doi.org/10.1007/BF01015910
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DOI: https://doi.org/10.1007/BF01015910