@article{MZ_1942__47_168971,
     author = {K., Kommerell},
     title = {Ma{\ss}kegelschnitt und {Trigonometrie}},
     journal = {Mathematische Zeitschrift},
     pages = {738--742},
     year = {1942},
     volume = {47},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MZ_1942__47_168971/}
}