1. Homoclinic for second order conservation systems;Ambrosetti,1992
2. Multiple homoclinic orbits for a class of conservative systems;Ambrosetti;Rend. Semin. Mat. Univ. Padova,1993
3. Periodic and homoclinic solutions to a class of Hamiltonian systems with indefinite potential in sign;Antonacci;Boll. Unione Mat. Ital. B,1996
4. Existence of homoclinic solutions for a class of time-dependent Hamiltonian systems;Carrião;J. Math. Anal. Appl.,1999
5. Existence and multiplicity results for homoclinic orbits of Hamiltonian systems;Chen;Electron. J. Differential Equations,1997