On centers of type $B$ of polynomial systems

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On centers of type $B$ of polynomial systems. (English). Archivum Mathematicum, vol. 26 (1990), issue 2, pp. 93-99

MSC: 34C05, 34C25 | MR 1188267 | Zbl 0732.34027

References:

[1 ] R. Conti: Centers of quadratic systems. Ricerche di Matem., Suppl. vol. 36 (1987), 117-126. MR 0956022 | Zbl 0685.34024

[2] W. A. Coppel: A survey of quadratic systems. J. Diff. Equations, 2 (1966), 293-306. MR 0196182 | Zbl 0143.11903

[3] J. K. Hale: Ordinary Differential Equations. Wiley-Interscience, 1969. MR 0419901 | Zbl 0186.40901

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