@article{PIM_1938_Tom_VI-VII_a10,
     author = {Branislav Petronievics},
     title = {Elementare {Ableitung} der nichteuklidischen {Geometrien}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {89 },
     publisher = {mathdoc},
     volume = {Tom_VI-VII},
     year = {1938},
     url = {http://geodesic.mathdoc.fr/item/PIM_1938_Tom_VI-VII_a10/}
}