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Additional information
Translated from Sibirskii Matematicheskii Zhurnal, Vol. 9, No. 1, pp. 104–115, January–February, 1965.
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Moskalenko, A.I. On central extensions of an abelian group by using an abelian grout. Soviet Mathematical Journal 9, 78–86 (1968). https://doi.org/10.1007/BF02196658
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DOI: https://doi.org/10.1007/BF02196658