Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1960_134_6_a11, author = {V. Ya. Urm}, title = {Reduction of systems of difference equations to canonical form}, journal = {Doklady Akademii Nauk}, pages = {1309--1312}, publisher = {mathdoc}, volume = {134}, number = {6}, year = {1960}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1960_134_6_a11/} }
V. Ya. Urm. Reduction of systems of difference equations to canonical form. Doklady Akademii Nauk, Tome 134 (1960) no. 6, pp. 1309-1312. http://geodesic.mathdoc.fr/item/DAN_1960_134_6_a11/