@misc{ELMA_1969__24_140933,
     title = {Neue {Aufgaben.}},
     journal = {Elemente der Mathematik},
     pages = {68--69},
     publisher = {mathdoc},
     volume = {24},
     year = {1969},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1969__24_140933/}
}