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@article{IVM_1990_3_a4, author = {A. V. Kraichuk}, title = {Groups with infinite normal subgroups of infinite index}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {31--37}, publisher = {mathdoc}, number = {3}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1990_3_a4/} }
A. V. Kraichuk. Groups with infinite normal subgroups of infinite index. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1990), pp. 31-37. http://geodesic.mathdoc.fr/item/IVM_1990_3_a4/