On the multiplicity of periodic orbits and homoclinics near critical energy levels of Hamiltonian systems in R4
Naiara Vergian de Paulo Pedro Antônio Santoro Salomão
Transactions of the American Mathematical Society Boston v. 372, n. 2, p. 859-887, 2019Boston 2019
Available at IME - Inst. Matemática e Estatística (PROD-2950914 )(GetIt)