@article{MAN_1969__180_161802,
     author = {S. BILINSKI},
     title = {Zur {Begr\"undung} der elementaren {Inhaltslehre} in der hyperbolischen {Ebene.}},
     journal = {Mathematische Annalen},
     pages = {256--268},
     publisher = {mathdoc},
     volume = {180},
     year = {1969},
     zbl = {0159.21702},
     url = {http://geodesic.mathdoc.fr/item/MAN_1969__180_161802/}
}