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@article{MZM_1989_46_4_a4, author = {N. Ya. Medvedev}, title = {Relative convexity of subgroups of finite rank}, journal = {Matemati\v{c}eskie zametki}, pages = {34--37}, publisher = {mathdoc}, volume = {46}, number = {4}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1989_46_4_a4/} }
N. Ya. Medvedev. Relative convexity of subgroups of finite rank. Matematičeskie zametki, Tome 46 (1989) no. 4, pp. 34-37. http://geodesic.mathdoc.fr/item/MZM_1989_46_4_a4/