Torsten Lindström, Handbook of the Mathematics of the Arts and Sciences, 2021, 2291
Stephen Lynch, Dynamical Systems with Applications using MAPLE, 2001, 181
N. B. Medvedeva, “On the analytic solvability of the problem of distinguishing between center and focus”, Proc. Steklov Inst. Math., 254, no. 1, 2006, 7
G. A. Kolyutsky, “Upper bounds on the number of limit cycles in generalized Liénard equations of odd type”, Dokl. Math., 81, no. 2, 2010, 176
Stephen Lynch, Dynamical Systems with Applications using Python, 2018, 271
Jibin Li, H. S. Y. Chan, K. W. Chung, “Some lower bounds forH(n) in Hilbert’s 16th problem”, Qual. Th. Dyn. Syst., 3, no. 2, 2002, 345
Daniel Panazzolo, “PSL(2, ℂ), the exponential and some new free groups”, The Quarterly Journal of Mathematics, 69, no. 1, 2018, 75
Antonio Algaba, Cristóbal García, Jaume Giné, “Geometric Criterium in the Center Problem”, Mediterr. J. Math., 13, no. 5, 2016, 2593
VÍCTOR MAÑOSA, “ON THE CENTER PROBLEM FOR DEGENERATE SINGULAR POINTS OF PLANAR VECTOR FIELDS”, Int. J. Bifurcation Chaos, 12, no. 04, 2002, 687
Xiang Zhang, “On the Limit Cycles of Quadratic Differential Systems”, Acta Math Sinica, 18, no. 4, 2002, 803