Geodesic
The problem of the center for differential equations with discontinuous right-hand sides
Differencialʹnye uravneniâ, Tome 4 (1968) no. 9, pp. 1625-1639.

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     author = {V. A. Lunkevich},
     title = {The problem of the center for differential equations with discontinuous right-hand sides},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1625--1639},
     publisher = {mathdoc},
     volume = {4},
     number = {9},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1968_4_9_a7/}
}
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V. A. Lunkevich. The problem of the center for differential equations with discontinuous right-hand sides. Differencialʹnye uravneniâ, Tome 4 (1968) no. 9, pp. 1625-1639. http://geodesic.mathdoc.fr/item/DE_1968_4_9_a7/