@article{ASENS_1869_1_6__347_0,
     author = {Beltrami, E.},
     title = {Th\'eorie fondamentale des espaces de courbure constante. {Trad.} par. {J.} {Ho\"uel}},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {347--375},
     publisher = {Elsevier},
     volume = {1e s{\'e}rie, 6},
     year = {1869},
     doi = {10.24033/asens.62},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.24033/asens.62/}
}