@article{BSMA_1871__2__341_1,
     author = {Klein, F\'elix},
     title = {Sur la g\'eom\'etrie dite non euclidienne},
     journal = {Bulletin des Sciences Math\'ematiques et Astronomiques},
     pages = {341--351},
     publisher = {Gauthier-Villars},
     volume = {2},
     year = {1871},
     language = {fr},
     url = {http://www.numdam.org/item/BSMA_1871__2__341_1/}
}