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@article{DAN_1983_271_6_a8, author = {V. V. Lychagin}, title = {Characteristic classes of solutions of differential equations}, journal = {Doklady Akademii Nauk}, pages = {1320--1324}, publisher = {mathdoc}, volume = {271}, number = {6}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1983_271_6_a8/} }
V. V. Lychagin. Characteristic classes of solutions of differential equations. Doklady Akademii Nauk, Tome 271 (1983) no. 6, pp. 1320-1324. http://geodesic.mathdoc.fr/item/DAN_1983_271_6_a8/