Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{ELMA_1957__12_140665, author = {H. Hadwiger}, title = {Ungel\"oste {Probleme.}}, journal = {Elemente der Mathematik}, pages = {61--62}, publisher = {mathdoc}, volume = {12}, year = {1957}, url = {http://geodesic.mathdoc.fr/item/ELMA_1957__12_140665/} }
H. Hadwiger. Ungelöste Probleme.. Elemente der Mathematik, Tome 12 (1957), pp. 61-62. http://geodesic.mathdoc.fr/item/ELMA_1957__12_140665/