Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{ELMA_1972__27_141056, author = {H. Hadwiger}, title = {Ungel\"oste {Probleme.}}, journal = {Elemente der Mathematik}, pages = {57--57}, publisher = {mathdoc}, volume = {27}, year = {1972}, url = {http://geodesic.mathdoc.fr/item/ELMA_1972__27_141056/} }
H. Hadwiger. Ungelöste Probleme.. Elemente der Mathematik, Tome 27 (1972), p. 57. http://geodesic.mathdoc.fr/item/ELMA_1972__27_141056/