Phase portraits of uniform isochronous quartic centers. - Jackson Itikawa; Jaume Llibre (J. Comput. Appl. Math., 2015)

Limit cycles for continuous and discontinuous perturbations of uniform isochronous cubic centers. - Jaume Llibre; Jackson Itikawa (J. Comput. Appl. Math., 2015)

Uniform isochronous cubic and quartic centers: Revisited. - Joan C. Artés; Jackson Itikawa; Jaume Llibre (J. Comput. Appl. Math., 2017)