@article{CMH_1990__65_3_140199,
     author = {Jean-Pierre Otal},
     title = {Sur les longueurs des g\'eod\'esiques d\`une m\'etrique \`a courbure n\'egative dans le disque.},
     journal = {Commentarii mathematici Helvetici},
     pages = {334--348},
     publisher = {mathdoc},
     volume = {65},
     number = {3},
     year = {1990},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/CMH_1990__65_3_140199/}
}