@misc{ELMA_1968__23_140889,
     title = {Neue {Aufgaben.}},
     journal = {Elemente der Mathematik},
     pages = {68--68},
     publisher = {mathdoc},
     volume = {23},
     year = {1968},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1968__23_140889/}
}