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@article{IM2_1969_3_4_a8, author = {A. Yu. Ol'shanskii}, title = {Varieties of finitely approximable groups}, journal = {Izvestiya. Mathematics }, pages = {867--877}, publisher = {mathdoc}, volume = {3}, number = {4}, year = {1969}, language = {en}, url = {http://geodesic.mathdoc.fr/item/IM2_1969_3_4_a8/} }
A. Yu. Ol'shanskii. Varieties of finitely approximable groups. Izvestiya. Mathematics , Tome 3 (1969) no. 4, pp. 867-877. http://geodesic.mathdoc.fr/item/IM2_1969_3_4_a8/