On the periodic orbits of the third-order differential equation x‴-μx″+x′-μx=εF(x, x′, x″). - Jaume Llibre; Luci A. F. Roberto (Appl. Math. Lett., 2013)

Asymptotic Expansion of the Heteroclinic Bifurcation for the Planar Normal Form of the 1: 2 Resonance. - Luci A. F. Roberto; Paulo Ricardo da Silva; Joan Torregrosa (Int. J. Bifurc. Chaos, 2016)