Geodesic
On the Coppel Problem for Quadratic Systems with a Fine Focus
Differencialʹnye uravneniâ, Tome 41 (2005) no. 8, pp. 1100-1104.

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     author = {L. A. Cherkas and I. L. Shevtsov},
     title = {On the {Coppel} {Problem} for {Quadratic} {Systems} with a {Fine} {Focus}},
     journal = {Differencialʹnye uravneni\^a},
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     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2005_41_8_a10/}
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L. A. Cherkas; I. L. Shevtsov. On the Coppel Problem for Quadratic Systems with a Fine Focus. Differencialʹnye uravneniâ, Tome 41 (2005) no. 8, pp. 1100-1104. http://geodesic.mathdoc.fr/item/DE_2005_41_8_a10/