Maximum number of limit cycles for certain piecewise linear dynamical systems

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Limit cycles for discontinuous planar piecewise linear differential systems separated by one straight line and having a center (2018, background): “In what follows we shall assume that a 6= 0 and c 6= 0, otherwise one of the two equilibria will be on the discontinuity straight line, and we know from [18] that the discontinuous piecewise linear differential system has at most 2 limit cycles.”
Limit cycles in planar piecewise linear differential systems with nonregular separation line (2016, background): “This upper bound is decreased by two in the same cases in [23, 24].”