Voir la notice de l'article dans European Digital Mathematics Library
@article{ELMA_1956__11_140654, author = {H. Hadwiger}, title = {Ungel\"oste {Probleme.}}, journal = {Elemente der Mathematik}, pages = {109--110}, publisher = {mathdoc}, volume = {11}, year = {1956}, url = {https://geodesic-test.mathdoc.fr/item/ELMA_1956__11_140654/} }
H. Hadwiger. Ungelöste Probleme.. Elemente der Mathematik, Tome 11 (1956), pp. 109-110. https://geodesic-test.mathdoc.fr/item/ELMA_1956__11_140654/