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Additional information
V. A. Steklov Mathematics Institute, Academy of Sciences of the USSR, Moscow. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 7, No. 2, pp. 250–261, May, 1971.
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Tserkovnikov, Y.A. Decoupling of chains of equations for two-time Green's functions. Theor Math Phys 7, 511–519 (1971). https://doi.org/10.1007/BF01028060
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DOI: https://doi.org/10.1007/BF01028060