Relaxation and Transients in a Time-Dependent logistic Map. - Edson Denis Leonel; J. Kamphorst Leal da Silva; Sylvie Oliffson Kamphorst (Int. J. Bifurc. Chaos, 2002)

The First Birkhoff Coefficient and the Stability of 2-Periodic Orbits on Billiards. - Sylvie Oliffson Kamphorst; Sônia Pinto-de-Carvalho (Exp. Math., 2005)