@article{MV_1972_24_1_a4,
     author = {Z. \v{S}najder},
     title = {Gemeinsame {Eigenschaften} der zentralen, normalen, parallelen und \"uberparallelen {Projektionen} im dreidimensionalen hyperbolischen {Raum}},
     journal = {Matemati\v{c}ki vesnik},
     pages = {27 },
     publisher = {mathdoc},
     volume = {24},
     number = {1},
     year = {1972},
     url = {http://geodesic.mathdoc.fr/item/MV_1972_24_1_a4/}
}