@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} }