@misc{ELMA_1973__28_141091,
     title = {Neue {Aufgaben.}},
     journal = {Elemente der Mathematik},
     pages = {19--20},
     year = {1973},
     volume = {28},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1973__28_141091/}
}