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The authors thank everyone who helped them in the writing of this survey.

Translated from Itogi Nauki i Tekhniki, Algebra, Topologiya, Geometriya, Vol. 17, pp. 65–157, 1979.

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Noskov, G.A., Remeslennikov, V.N. & Roman'kov, V.A. Infinite groups. J Math Sci 18, 669–735 (1982). https://doi.org/10.1007/BF01091962

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