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@article{DE_1968_4_9_a6, author = {L. A. Chelysheva}, title = {On the theory of generalized characteristic numbers}, journal = {Differencialʹnye uravneni\^a}, pages = {1616--1624}, publisher = {mathdoc}, volume = {4}, number = {9}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1968_4_9_a6/} }
L. A. Chelysheva. On the theory of generalized characteristic numbers. Differencialʹnye uravneniâ, Tome 4 (1968) no. 9, pp. 1616-1624. http://geodesic.mathdoc.fr/item/DE_1968_4_9_a6/