@article{ELMA_1967__22_140836,
     author = {Esther Szekeres},
     title = {Einfache {Beweise} zweier {Dreieckss\"atze.}},
     journal = {Elemente der Mathematik},
     pages = {17--18},
     publisher = {mathdoc},
     volume = {22},
     year = {1967},
     zbl = {0149.17801},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1967__22_140836/}
}