Abstract
Within the class of quadratic perturbations we show analytically or numerically how many limit cycles can be bifurcated at first order out of the periodic orbits surrounding the center of the quadratic system $$ \dot x=x(1-x-ay)\quad\text{and}\quad \dot y=y(-1+ax+y),\quad\text{where }1<a<\infty. $$
Citation
J. W. Reyn. W. T. van Horssen. "Bifurcation of limit cycles in a particular class of quadratic systems." Differential Integral Equations 8 (4) 907 - 920, 1995. https://doi.org/10.57262/die/1369055619
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