@article{MZ_1952__56_169279,
     author = {G\"unter Pickert},
     title = {Der {Satz} vom vollst\"andigen {Viereck} bei kollinearen {Diagonalpunkten.}},
     journal = {Mathematische Zeitschrift},
     pages = {131--133},
     publisher = {mathdoc},
     volume = {56},
     year = {1952},
     zbl = {0046.14403},
     url = {http://geodesic.mathdoc.fr/item/MZ_1952__56_169279/}
}