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@article{DAN_1981_261_6_a3, author = {V. V. Lychagin}, title = {Geometric singularities of solutions of nonlinear differential equations}, journal = {Doklady Akademii Nauk}, pages = {1299--1303}, publisher = {mathdoc}, volume = {261}, number = {6}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1981_261_6_a3/} }
V. V. Lychagin. Geometric singularities of solutions of nonlinear differential equations. Doklady Akademii Nauk, Tome 261 (1981) no. 6, pp. 1299-1303. http://geodesic.mathdoc.fr/item/DAN_1981_261_6_a3/