Normal-Size Limit Cycles of Quadratic Systems with a Structurally Unstable Focus
Differencialʹnye uravneniâ, Tome 40 (2004) no. 8, pp. 1076-1084.

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     author = {L. A. Cherkas and I. L. Shevtsov},
     title = {Normal-Size {Limit} {Cycles} of {Quadratic} {Systems} with a {Structurally} {Unstable} {Focus}},
     journal = {Differencialʹnye uravneni\^a},
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     url = {http://geodesic.mathdoc.fr/item/DE_2004_40_8_a7/}
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L. A. Cherkas; I. L. Shevtsov. Normal-Size Limit Cycles of Quadratic Systems with a Structurally Unstable Focus. Differencialʹnye uravneniâ, Tome 40 (2004) no. 8, pp. 1076-1084. http://geodesic.mathdoc.fr/item/DE_2004_40_8_a7/