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Hoang Ky, “Strongly π-complete groups, πSR-groups, and πSD-groups,” Sibirsk. Matem. Zh.,10, No. 6 (1969).
G. Baumlag, “Some aspects of groups with unique roots,” Acta Math.,104, No. 3–4, 217–303 (1960).
O. N. Golovin, “Nilpotent products of groups,” Matem. Sb. (Nov. Ser.),27(29), No. 3 (1950).
S. Morna, “Associative operations on groups (I),” Proc. London Math. Soc.,6(3), No. 24, 580–596 (1956).
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