@article{10_14708_cm_v2i2_5410,
     author = {S. Straszewicz},
     title = {O podstawowych twierdzeniach trygonometrii {{\L}obaczewskiego}},
     journal = {Commentationes Mathematicae},
     pages = { 269--286},
     publisher = {mathdoc},
     volume = {2},
     number = {2},
     year = {1956},
     doi = {10.14708/cm.v2i2.5410},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v2i2.5410/}
}