Murilo R. Cândido, Jaume Llibre, Claudia Valls, “Non-existence, existence, and uniqueness of limit cycles for a generalization of the Van der Pol–Duffing and the Rayleigh–Duffing oscillators”, Physica D: Nonlinear Phenomena, 407, 2020, 132458
Armengol Gasull, Chengzhi Li, Joan Torregrosa, “Limit cycles appearing from the perturbation of a system with a multiple line of critical points”, Nonlinear Analysis: Theory, Methods & Applications, 75, № 1, 2012, 278
Armengol Gasull, Hector Giacomini, 54, Progress and Challenges in Dynamical Systems, 2013, 233
L. A. Cherkas, A. A. Grin’, “Bendixson-Dulac criterion and reduction to global uniqueness in the problem of estimating the number of limit cycles”, Diff Equat, 46, № 1, 2010, 61
Jaume Llibre, João C. Medrado, “Limit cycles, invariant meridians and parallels for polynomial vector fields on the torus”, Bulletin des Sciences Mathématiques, 135, № 1, 2011, 1
D. Marín, J. Villadelprat, “Asymptotic expansion of the Dulac map and time for unfoldings of hyperbolic saddles: General setting”, Journal of Differential Equations, 275, 2021, 684
M. Esteban, J. Llibre, C. Valls, “The 16th Hilbert problem for discontinuous piecewise isochronous centers of degree one or two separated by a straight line”, Chaos: An Interdisciplinary Journal of Nonlinear Science, 31, № 4, 2021, 043112
TOMAS JOHNSON, WARWICK TUCKER, “AN IMPROVED LOWER BOUND ON THE NUMBER OF LIMIT CYCLES BIFURCATING FROM A QUINTIC HAMILTONIAN PLANAR VECTOR FIELD UNDER QUINTIC PERTURBATION”, Int. J. Bifurcation Chaos, 20, № 01, 2010, 63
Man Jia, Haibo Chen, Hebai Chen, “Bifurcation Diagram and Global Phase Portraits of a Family of Quadratic Vector Fields in Class I”, Qual. Theory Dyn. Syst., 19, № 2, 2020, 64
Armengol Gasull, Hector Giacomini, “Effectiveness of the Bendixson–Dulac theorem”, Journal of Differential Equations, 305, 2021, 347