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Additional information
V. A. Steklov Mathematics Institute, Academy of Sciences of the USSR. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 22, No. 2, pp.177–185, February, 1975.
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Slavnov, A.A. Functional integral in perturbation theory. Theor Math Phys 22, 123–128 (1975). https://doi.org/10.1007/BF01036316
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DOI: https://doi.org/10.1007/BF01036316