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Additional information
Joint Institute of Nuclear Research. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 5, No. 1, pp. 147–153, October, 1970.
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Plakida, N.M. Decoupling of two-time Green's functions and diagrammatic analysis. Theor Math Phys 5, 1047–1052 (1970). https://doi.org/10.1007/BF01035987
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DOI: https://doi.org/10.1007/BF01035987