Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1992_323_4_a2, author = {A. Dzhuraev}, title = {Degenerate systems of first-order partial differential systems}, journal = {Doklady Akademii Nauk}, pages = {623--627}, publisher = {mathdoc}, volume = {323}, number = {4}, year = {1992}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1992_323_4_a2/} }
A. Dzhuraev. Degenerate systems of first-order partial differential systems. Doklady Akademii Nauk, Tome 323 (1992) no. 4, pp. 623-627. http://geodesic.mathdoc.fr/item/DAN_1992_323_4_a2/