Geodesic
On a periodic boundary value problem for an implicit differential equation
Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta, Tome 39 (2012) no. 1, pp. 52-53.

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We derive the conditions of solvability of a periodic boundary value problem for a differential equation unsolved for the derivative. Methods of the theory of covering mappings are used.
Keywords: periodic boundary value problem, implicit differential equation, covering and conditionally covering mappings. 
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E. S. Zhukovskii; E. A. Pluzhnikova. On a periodic boundary value problem for an implicit differential equation. Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta, Tome 39 (2012) no. 1, pp. 52-53. http://geodesic.mathdoc.fr/item/IIMI_2012_39_1_a21/

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[4] Zhukovskii E.S., Pluzhnikova E.A., “Ob odnom metode issledovaniya razreshimosti kraevykh zadach dlya differentsialnykh uravnenii”, Vestnik Tambovskogo universiteta. Seriya: Estestvennye i tekhnicheskie nauki, 15:6 (2010), 1673–1674

[5] Zhukovskii E.S., Pluzhnikova E.A., “Nakryvayuschie otobrazheniya v probleme korrektnosti kraevykh zadach dlya differentsialnykh uravnenii, ne razreshennykh otnositelno proizvodnoi”, Vestnik Tambovskogo universiteta. Seriya: Estestvennye i tekhnicheskie nauki, 16:4 (2011), 1082–1085