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@article{MZM_1980_27_2_a10, author = {A. F. Filippov}, title = {A system of differential equations with some discontinuous functions}, journal = {Matemati\v{c}eskie zametki}, pages = {255--266}, publisher = {mathdoc}, volume = {27}, number = {2}, year = {1980}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1980_27_2_a10/} }
A. F. Filippov. A system of differential equations with some discontinuous functions. Matematičeskie zametki, Tome 27 (1980) no. 2, pp. 255-266. http://geodesic.mathdoc.fr/item/MZM_1980_27_2_a10/