@article{ELMA_1962__17_140744,
     author = {Hermann Schaal},
     title = {Pr\"ufung einer {Kreisform} mit {Hohlwinkel} und {Taster.}},
     journal = {Elemente der Mathematik},
     pages = {33--38},
     publisher = {mathdoc},
     volume = {17},
     year = {1962},
     zbl = {0109.14903},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1962__17_140744/}
}