Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1976_231_4_a2, author = {Yu. Ya. Belov}, title = {On strongly hyperbolic systems with a small parameter in {Hilbert} space}, journal = {Doklady Akademii Nauk}, pages = {784--787}, publisher = {mathdoc}, volume = {231}, number = {4}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1976_231_4_a2/} }
Yu. Ya. Belov. On strongly hyperbolic systems with a small parameter in Hilbert space. Doklady Akademii Nauk, Tome 231 (1976) no. 4, pp. 784-787. http://geodesic.mathdoc.fr/item/DAN_1976_231_4_a2/