Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{ELMA_1973__28_141111, author = {H. Hadwiger}, title = {Ungel\"oste {Probleme.}}, journal = {Elemente der Mathematik}, pages = {97--97}, publisher = {mathdoc}, volume = {28}, year = {1973}, url = {http://geodesic.mathdoc.fr/item/ELMA_1973__28_141111/} }
H. Hadwiger. Ungelöste Probleme.. Elemente der Mathematik, Tome 28 (1973), p. 97. http://geodesic.mathdoc.fr/item/ELMA_1973__28_141111/