Voir la notice de l'article provenant de la source European Digital Mathematics Library
@misc{ELMA_1966__21_140827, title = {Ungel\"oste {Probleme.}}, journal = {Elemente der Mathematik}, pages = {90--90}, publisher = {mathdoc}, volume = {21}, year = {1966}, url = {http://geodesic.mathdoc.fr/item/ELMA_1966__21_140827/} }
Ungelöste Probleme.. Elemente der Mathematik, Tome 21 (1966), p. 90. http://geodesic.mathdoc.fr/item/ELMA_1966__21_140827/