@Article{ LerRiz14, author = { Lerario, Antonio and Rizzi, Luca }, title = { How many geodesics join two points on a contact sub-Riemannian manifold? }, journal = { Journal of symplectic geometry }, year = { 2017 }, doi = { 10.4310/JSG.2017.v15.n1.a7 }, volume = { Volume 15 }, number = { 1 }, pages = { 247 – 305 }, URL = { http://cvgmt.sns.it/paper/2436/ }, note = { cvgmt preprint} }