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@article{DE_1970_6_4_a1, author = {A. M. Letov}, title = {Some unsolved problems of automatic control theory}, journal = {Differencialʹnye uravneni\^a}, pages = {592--615}, publisher = {mathdoc}, volume = {6}, number = {4}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1970_6_4_a1/} }
A. M. Letov. Some unsolved problems of automatic control theory. Differencialʹnye uravneniâ, Tome 6 (1970) no. 4, pp. 592-615. http://geodesic.mathdoc.fr/item/DE_1970_6_4_a1/