Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1962_144_4_a4, author = {V. P. Didenko}, title = {Some systems of differential equations of mixed type}, journal = {Doklady Akademii Nauk}, pages = {709--712}, publisher = {mathdoc}, volume = {144}, number = {4}, year = {1962}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1962_144_4_a4/} }
V. P. Didenko. Some systems of differential equations of mixed type. Doklady Akademii Nauk, Tome 144 (1962) no. 4, pp. 709-712. http://geodesic.mathdoc.fr/item/DAN_1962_144_4_a4/