@misc{ELMA_1950__5_140557,
     title = {Aufgaben.},
     journal = {Elemente der Mathematik},
     pages = {137--140},
     publisher = {mathdoc},
     volume = {5},
     year = {1950},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1950__5_140557/}
}