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@article{DE_1971_7_4_a5, author = {M. S. Nikol'skii}, title = {Ideally observable systems}, journal = {Differencialʹnye uravneni\^a}, pages = {631--638}, publisher = {mathdoc}, volume = {7}, number = {4}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1971_7_4_a5/} }
M. S. Nikol'skii. Ideally observable systems. Differencialʹnye uravneniâ, Tome 7 (1971) no. 4, pp. 631-638. http://geodesic.mathdoc.fr/item/DE_1971_7_4_a5/