Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{ELMA_1968__23_140874, author = {H. Hadwiger}, title = {Ungel\"oste {Probleme.}}, journal = {Elemente der Mathematik}, pages = {14--15}, publisher = {mathdoc}, volume = {23}, year = {1968}, url = {http://geodesic.mathdoc.fr/item/ELMA_1968__23_140874/} }
H. Hadwiger. Ungelöste Probleme.. Elemente der Mathematik, Tome 23 (1968), pp. 14-15. http://geodesic.mathdoc.fr/item/ELMA_1968__23_140874/