Nonlinear Stability in Resonant Cases: A Geometrical Approach. - Antonio Elipe; Víctor Lanchares; Teodoro López-Moratalla; Andrés Riaguas (J. Nonlinear Sci., 2001)

Numerical analysis of periodic solutions and bifurcations in the planetary annulus problem. - Eva Tresaco; Andrés Riaguas; Antonio Elipe (Appl. Math. Comput., 2013)