@article{MAN_1955__130_160462,
     author = {M.-H. Amsler},
     title = {Des surfaces \`a courbure n\'egative constante dans l'espace \`a trois dimensions et de leurs singularit\'es.},
     journal = {Mathematische Annalen},
     pages = {234--256},
     publisher = {mathdoc},
     volume = {130},
     year = {1955},
     zbl = {0068.35102},
     url = {http://geodesic.mathdoc.fr/item/MAN_1955__130_160462/}
}