Invariant Tori Fulfilled by Periodic orbits for Four-Dimensional Differential Systems in the Presence of Resonance. - Jaume Llibre; Ana Cristina Mereu; Marco Antonio Teixeira (Int. J. Bifurc. Chaos, 2010)

Crossing Limit Cycles from Discontinuous Piecewise Linear Differential Centers Separated by Two Circles. - Sonia Renteria Alva; Ana Cristina Mereu (Int. J. Bifurc. Chaos, 2025)