@article{MOMA_1973__77_177642,
     author = {Stanko Bilinski},
     title = {\"Uber {Ptolem\"aische} {S\"atze.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {193--205},
     publisher = {mathdoc},
     volume = {77},
     year = {1973},
     zbl = {0261.50009},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1973__77_177642/}
}