@article{ELMA_1949__4_140513,
     author = {G. Grimm},
     title = {Zur {Kreisberechnung} von {Huygens.}},
     journal = {Elemente der Mathematik},
     pages = {78--85},
     publisher = {mathdoc},
     volume = {4},
     year = {1949},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1949__4_140513/}
}