@misc{ELMA_1947__2_140457,
     title = {Aufgaben.},
     journal = {Elemente der Mathematik},
     pages = {42--44},
     publisher = {mathdoc},
     volume = {2},
     year = {1947},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1947__2_140457/}
}