@article{article1bee27a5,
title   = {Bifurcations of periodic trajectories in non-integrable hamiltonian systems with two degrees of freedom: numerical and analytical results},
author = {Aguiar, M A M and Malta, Coraci Pereira and Baranger, M and Davies, K T R},
year = {1987},
doi = {10.1016/0003-4916(87)90044-3},
journal   = {Annals of Physics}
}