- Jaume Llibre, “ON THE INTEGRABILITY OF THE DIFFERENTIAL SYSTEMS IN DIMENSION TWO AND OF THE POLYNOMIAL DIFFERENTIAL SYSTEMS IN ARBITRARY DIMENSION”, jaac, 1, № 1, 2011, 33
- Jaume Llibre, Dana Schlomiuk, “The Geometry of Quadratic Differential Systems with a Weak Focus of Third Order”, Can. j. math., 56, № 2, 2004, 310
- Marta Calanchi, Bernhard Ruf, Nonlinear Equations: Methods, Models and Applications, 2003, 53
- Emad A. Az-Zo’bi, Kamel Al-Khaled, Amer Darweesh, “Numeric-Analytic Solutions for Nonlinear Oscillators via the Modified Multi-Stage Decomposition Method”, Mathematics, 7, № 6, 2019, 550
- N. B. Medvedeva, “The problem of distinguishing between a centre and a focus in the space of vector fields with given Newton diagram”, Sb. Math., 211, № 10, 2020, 1399
- LIE-HUI ZHANG, YONG WANG, “A NOTE ON PERIODIC SOLUTIONS OF A FORCED LIÉNARD-TYPE EQUATION”, ANZIAM J., 51, № 3, 2010, 350
- Isaac A. García, “Center cyclicity for some nilpotent singularities including the ℤ2-equivariant class”, Commun. Contemp. Math., 23, № 07, 2021, 2050053
- Jean-Pierre Ramis, Handbook of Geometry and Topology of Singularities VI: Foliations, 2024, 383
- Tiago M. P. de Abreu, Ricardo M. Martins, “Estimates for the Number of Limit Cycles in Discontinuous Generalized Liénard Equations”, Qual. Theory Dyn. Syst., 23, № 4, 2024, 187
- Vinícius Barros da Silva, João Peres Vieira, Edson Denis Leonel, “Exploring Limit Cycles of Differential Equations through Information Geometry Unveils the Solution to Hilbert’s 16th Problem”, Entropy, 26, № 9, 2024, 745