Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1993_3_a1, author = {O. V. Belegradek}, title = {Unitriangular groups and undecidability}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {19--22}, publisher = {mathdoc}, number = {3}, year = {1993}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1993_3_a1/} }
O. V. Belegradek. Unitriangular groups and undecidability. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1993), pp. 19-22. http://geodesic.mathdoc.fr/item/IVM_1993_3_a1/