@article{articlefbe31bce,
title   = {On the multiplicity of periodic orbits and homoclinics near critical energy levels of Hamiltonian systems in R4},
author = {Paulo, Naiara Vergian de and Salomão, Pedro Antônio Santoro},
year = {2019},
doi = {10.1090/tran/7568},
journal   = {Transactions of the American Mathematical Society}
}