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@article{DAN_1974_216_4_a6, author = {A. V. Pokrovskii and M. A. Krasnosel'skii}, title = {Periodic oscillations in systems with relay nonlinearities}, journal = {Doklady Akademii Nauk}, pages = {733--736}, publisher = {mathdoc}, volume = {216}, number = {4}, year = {1974}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1974_216_4_a6/} }
A. V. Pokrovskii; M. A. Krasnosel'skii. Periodic oscillations in systems with relay nonlinearities. Doklady Akademii Nauk, Tome 216 (1974) no. 4, pp. 733-736. http://geodesic.mathdoc.fr/item/DAN_1974_216_4_a6/