Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1961_139_1_a9, author = {V. Ya. Urm}, title = {Necessary and sufficient conditions for the stability of a system of difference equations}, journal = {Doklady Akademii Nauk}, pages = {40--43}, publisher = {mathdoc}, volume = {139}, number = {1}, year = {1961}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1961_139_1_a9/} }
V. Ya. Urm. Necessary and sufficient conditions for the stability of a system of difference equations. Doklady Akademii Nauk, Tome 139 (1961) no. 1, pp. 40-43. http://geodesic.mathdoc.fr/item/DAN_1961_139_1_a9/