Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{ELMA_1959__14_140696, author = {H. Hadwiger}, title = {Ungel\"oste {Probleme.}}, journal = {Elemente der Mathematik}, pages = {60--61}, publisher = {mathdoc}, volume = {14}, year = {1959}, url = {http://geodesic.mathdoc.fr/item/ELMA_1959__14_140696/} }
H. Hadwiger. Ungelöste Probleme.. Elemente der Mathematik, Tome 14 (1959), pp. 60-61. http://geodesic.mathdoc.fr/item/ELMA_1959__14_140696/