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@article{DE_1989_25_11_a8, author = {A. Yu. Kolesov and E. F. Mishchenko}, title = {A problem of {Pontryagin}}, journal = {Differencialʹnye uravneni\^a}, pages = {1888--1891}, publisher = {mathdoc}, volume = {25}, number = {11}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1989_25_11_a8/} }
A. Yu. Kolesov; E. F. Mishchenko. A problem of Pontryagin. Differencialʹnye uravneniâ, Tome 25 (1989) no. 11, pp. 1888-1891. http://geodesic.mathdoc.fr/item/DE_1989_25_11_a8/