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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 40, No. 3, pp. 303–309, May–June, 1988.
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Zaitsev, D.I. Direct sums of infinite Abelian groups with operators. Ukr Math J 40, 257–263 (1988). https://doi.org/10.1007/BF01061301
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DOI: https://doi.org/10.1007/BF01061301