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@article{DE_1989_25_8_a5, author = {A. V. Savkin}, title = {Frequency criteria for the stability and instability of linear periodic systems}, journal = {Differencialʹnye uravneni\^a}, pages = {1332--1339}, publisher = {mathdoc}, volume = {25}, number = {8}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1989_25_8_a5/} }
A. V. Savkin. Frequency criteria for the stability and instability of linear periodic systems. Differencialʹnye uravneniâ, Tome 25 (1989) no. 8, pp. 1332-1339. http://geodesic.mathdoc.fr/item/DE_1989_25_8_a5/