Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1992_323_2_a12, author = {M. M. Khapaev}, title = {Singular differential equations in problems on the investigation}, journal = {Doklady Akademii Nauk}, pages = {250--252}, publisher = {mathdoc}, volume = {323}, number = {2}, year = {1992}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1992_323_2_a12/} }
M. M. Khapaev. Singular differential equations in problems on the investigation. Doklady Akademii Nauk, Tome 323 (1992) no. 2, pp. 250-252. http://geodesic.mathdoc.fr/item/DAN_1992_323_2_a12/