MathSciNet bibliographic data MR2877382 34C05 (34A36 34C07 34C23 34C29) Buzzi, C. A.; Llibre, J.; Medrado, J. C. On the limit cycles of a class of piecewise linear differential systems in \$\Bbb R\sp 4\$$\Bbb R\sp 4$ with two zones. Math. Comput. Simulation 82 (2011), no. 4, 533–539. Article

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