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@article{DE_1978_14_11_a16, author = {A. P. Ivanov}, title = {On the problem of observation of perturbed systems}, journal = {Differencialʹnye uravneni\^a}, pages = {2071--2072}, publisher = {mathdoc}, volume = {14}, number = {11}, year = {1978}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1978_14_11_a16/} }
A. P. Ivanov. On the problem of observation of perturbed systems. Differencialʹnye uravneniâ, Tome 14 (1978) no. 11, pp. 2071-2072. http://geodesic.mathdoc.fr/item/DE_1978_14_11_a16/