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Additional information
Minsk. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 30, No. 2, pp. 73–84, March–April, 1989.
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Zalesskii, P.A. A geometric characterization of free formations of profinite groups. Sib Math J 30, 227–235 (1989). https://doi.org/10.1007/BF00971377
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DOI: https://doi.org/10.1007/BF00971377