Limit cycles for discontinuous quadratic differential systems with two zones

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Bifurcation of limit cycles at infinity in piecewise polynomial systems (2018, background): “[24,25] studied the limit cycles that bifurcate from the quadratic and cubic isochronous centers when the systems are perturbed within the class of piecewise quadratic and cubic polynomial differential systems, respectively.”
New lower bound for the Hilbert number in piecewise quadratic differential systems (2018, methodology): “The first order averaging method was used in [22] to get 4 and 5 limit cycles by perturbing, respectively, the centers S1 and S2 inside the class of piecewise quadratic systems with two zones separated by the straight line y = 0.”