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Translated from Matematicheskie Zametki, Vol. 45, No. 5, pp. 32–37, May, 1989.
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Kravchenko, A.A. Balanced and cobalanced Butler groups. Mathematical Notes of the Academy of Sciences of the USSR 45, 369–373 (1989). https://doi.org/10.1007/BF01157930
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DOI: https://doi.org/10.1007/BF01157930