@article{10_4064_ap_3_2_225_239,
     author = {Stefan Straszewicz},
     title = {Sur la trigonom\'etrie de {Lobatchevsky}},
     journal = {Annales Polonici Mathematici},
     pages = {225--239},
     publisher = {mathdoc},
     volume = {3},
     number = {2},
     year = {1956},
     doi = {10.4064/ap-3-2-225-239},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-3-2-225-239/}
}