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Moscow Institute of Railway Transport Engineering. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 15, No. 1, pp. 18–22, January–March, 1981.
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Gaposhkin, V.F. Individual ergodic theorem for normal operators in L2 . Funct Anal Its Appl 15, 14–18 (1981). https://doi.org/10.1007/BF01082374
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DOI: https://doi.org/10.1007/BF01082374