@misc{ELMA_1969__24_140945,
     title = {Neue {Aufgaben.}},
     journal = {Elemente der Mathematik},
     pages = {117--118},
     year = {1969},
     volume = {24},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1969__24_140945/}
}