@Article{ 
  GroFusNov17,
  author = { Fusco, Giorgio and Gronchi, Giovanni Federico and Novaga, Matteo },
  title = { On the existence of connecting orbits for critical values of the energy },
  journal = { J. Differential Eqs. },
  year = { 2017 },
  volume = { 263 },
  number = { 12 },
  pages = { 8848-8872 },
  URL = { http://cvgmt.sns.it/paper/3317/ },
  note = { cvgmt preprint}
}