Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1985_285_5_a11, author = {V. V. Uspenskii}, title = {Subgroups of free topological groups}, journal = {Doklady Akademii Nauk}, pages = {1070--1072}, publisher = {mathdoc}, volume = {285}, number = {5}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1985_285_5_a11/} }
V. V. Uspenskii. Subgroups of free topological groups. Doklady Akademii Nauk, Tome 285 (1985) no. 5, pp. 1070-1072. http://geodesic.mathdoc.fr/item/DAN_1985_285_5_a11/