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@article{INTG_1981_12_a4, author = {N. V. Stepanov}, title = {Geometry of differential equations}, journal = {Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara}, pages = {127--164}, publisher = {mathdoc}, volume = {12}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/INTG_1981_12_a4/} }
N. V. Stepanov. Geometry of differential equations. Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara, Itogi Nauki i Tekhniki. Seriya "Problemy Geometrii", Tome 12 (1981), pp. 127-164. http://geodesic.mathdoc.fr/item/INTG_1981_12_a4/