@article{ELMA_1988__43_3_141440,
     author = {Hans Walser},
     title = {Ein {Schliessungssatz} der {Elementargeometrie.}},
     journal = {Elemente der Mathematik},
     pages = {161--169},
     publisher = {mathdoc},
     volume = {43},
     number = {3},
     year = {1988},
     zbl = {0707.51021},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1988__43_3_141440/}
}