Applicationes Mathematicae > 1995 > 23 > 3 > 339-350
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journal ISSN : | 1233-7234 |
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[1] N. N. Bautin, On the number of limit cycles which appear with the variation of coefficients from an equilibrium position of focus or center of type (R), Mat. Sb. 30 (72) (1952), 181-196 (in Russian); English transl.: Amer. Math. Soc. Transl. 100 (1954), 397-413.
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[2] J. Chavarriga, Integrable systems in the plane with a center type linear part, Appl. Math. (Warsaw) 22 (1994), 285-309.
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[3] C. Li, Two problems of planar quadratic systems, Sci. Sinica Ser. A 26 (1983), 471-481.