Geometric theory of singularities of solutions of nonlinear differential equations
Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara, Itogi Nauki i Tekhniki. Seriya "Problemy Geometrii", Tome 20 (1988), pp. 207-247.

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     author = {V. V. Lychagin},
     title = {Geometric theory of singularities of solutions of nonlinear differential equations},
     journal = {Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara},
     pages = {207--247},
     publisher = {mathdoc},
     volume = {20},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTG_1988_20_a4/}
}
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V. V. Lychagin. Geometric theory of singularities of solutions of nonlinear differential equations. Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara, Itogi Nauki i Tekhniki. Seriya "Problemy Geometrii", Tome 20 (1988), pp. 207-247. http://geodesic.mathdoc.fr/item/INTG_1988_20_a4/