@article{CMH_1940__13_138757,
     author = {B. de Ker\'ekj\'art\'o},
     title = {Nouvelle m\'ethode d'\'edifier la g\'eom\'etrie plane de {Bolyai} et de {Lobatchefski.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {11--48},
     publisher = {mathdoc},
     volume = {13},
     year = {1940},
     zbl = {66.0710.04},
     url = {http://geodesic.mathdoc.fr/item/CMH_1940__13_138757/}
}