Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1978_24_3_a13, author = {A. I. Shkuratskii}, title = {The problem of generation of free groups by two unitary triangular matrices}, journal = {Matemati\v{c}eskie zametki}, pages = {411--414}, publisher = {mathdoc}, volume = {24}, number = {3}, year = {1978}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1978_24_3_a13/} }
A. I. Shkuratskii. The problem of generation of free groups by two unitary triangular matrices. Matematičeskie zametki, Tome 24 (1978) no. 3, pp. 411-414. http://geodesic.mathdoc.fr/item/MZM_1978_24_3_a13/