Geodesic
A sufficient condition for a polynomial centre to be global
Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni, Série 9, Tome 2 (1991) no. 4, pp. 281-285.

Voir la notice de l'article provenant de la source Biblioteca Digitale Italiana di Matematica

A sufficient condition is given in order that a centre of a polynomial planar autonomous system be a global centre.
Per il sistema autonomo differenziale \( (S) \) del testo si danno condizióni sufficienti affinché l'origine.\( O \) sia un centro globale. 
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Sabatini, Marco. A sufficient condition for a polynomial centre to be global. Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni, Série 9, Tome 2 (1991) no. 4, pp. 281-285. http://geodesic.mathdoc.fr/item/RLIN_1991_9_2_4_a1/

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