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@article{DE_1976_12_6_a6, author = {E. L. Tonkov}, title = {The linear problem on the optimal control of periodic solutions}, journal = {Differencialʹnye uravneni\^a}, pages = {1007--1011}, publisher = {mathdoc}, volume = {12}, number = {6}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1976_12_6_a6/} }
E. L. Tonkov. The linear problem on the optimal control of periodic solutions. Differencialʹnye uravneniâ, Tome 12 (1976) no. 6, pp. 1007-1011. http://geodesic.mathdoc.fr/item/DE_1976_12_6_a6/