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Additional information
V. A. Steklov Mathematics Institute, Academy of Sciences of the USSR, Moscow. Joint Institute for Nuclear Research, Dubna. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 18, No. 1, pp. 27–38, January, 1974.
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Zav'yalov, O.I., Medvedev, P.B. The R operation in the λϕ4 theory as a consequence of an indefinite metric in the extended space of states (lowest orders). Theor Math Phys 18, 19–27 (1974). https://doi.org/10.1007/BF01036921
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DOI: https://doi.org/10.1007/BF01036921