Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1963_150_1_a10, author = {D. M. Smirnov}, title = {On reduced free multi-operator groups}, journal = {Doklady Akademii Nauk}, pages = {44--47}, publisher = {mathdoc}, volume = {150}, number = {1}, year = {1963}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1963_150_1_a10/} }
D. M. Smirnov. On reduced free multi-operator groups. Doklady Akademii Nauk, Tome 150 (1963) no. 1, pp. 44-47. http://geodesic.mathdoc.fr/item/DAN_1963_150_1_a10/