@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/}
}