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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. 21, No. 3, pp. 322–328, December, 1974.
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Zav'yalov, O.I. Comments on the structure of the R-operation. Theor Math Phys 21, 1173–1178 (1974). https://doi.org/10.1007/BF01038095
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DOI: https://doi.org/10.1007/BF01038095