D. d. C. Braga, F. S. Dias, J. Llibre, L. F. Mello.   NEW 2025-09-02
Polynomial differential systems with an arbitrary number of limit cycles surrounding a star node.
J. Differential Equations, 445, 113740 (6 pages). 2025. [DOI]
PreprintAbstract

J. Llibre, C. Valls.   NEW 2025-08-26
On a class of rigid polynomial centers.
J. Dyn. Control Syst., 31(Article 27), 17 pages. 2025. [DOI]
PreprintAbstract