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Translated from Matematicheskie Zametki, Vol. 35, No. 3, pp. 397–404, March, 1984.
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Gaposhkin, V.F. Tauberian ergodic theorem for normal contraction operators. Mathematical Notes of the Academy of Sciences of the USSR 35, 208–212 (1984). https://doi.org/10.1007/BF01139918
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DOI: https://doi.org/10.1007/BF01139918