@article{LFMO_1926_1_1_a11,
     author = {O. \v{Z}itomirskij},
     title = {Zur nichteuklidischen {Kreisgeometrie}},
     journal = {Journal de la Soci\'et\'e Physico-Math\'ematique de L\'eningrade },
     pages = {119--143},
     publisher = {mathdoc},
     volume = {1},
     number = {1},
     year = {1926},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/LFMO_1926_1_1_a11/}
}