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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 22, No. 4, pp. 566–571, July–August, 1970.
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Ky, H. Extensions and nilpotent products of strongly Π-complete, ΠSR-, and ΠSD-groups. Ukr Math J 22, 489–493 (1970). https://doi.org/10.1007/BF01090777
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DOI: https://doi.org/10.1007/BF01090777