Perturbation results for a class of singular Hamiltonian systems
Antonio Ambrosetti, Ivar Ekeland (1989)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti
Similarity:
The existence of solutions with prescribed period for a class of Hamiltonian systems with a Keplerian singularity is discussed.