Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1967_172_2_a0, author = {I. U. Bronshtein}, title = {Verbal subgroups of free groups}, journal = {Doklady Akademii Nauk}, pages = {255--257}, publisher = {mathdoc}, volume = {172}, number = {2}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1967_172_2_a0/} }
I. U. Bronshtein. Verbal subgroups of free groups. Doklady Akademii Nauk, Tome 172 (1967) no. 2, pp. 255-257. http://geodesic.mathdoc.fr/item/DAN_1967_172_2_a0/