@article{ELMA_1965__20_140805, author = {L. Fejes T\'oth}, title = {Ungel\"oste {Probleme.}}, journal = {Elemente der Mathematik}, pages = {61--63}, publisher = {mathdoc}, volume = {20}, year = {1965}, url = {http://geodesic.mathdoc.fr/item/ELMA_1965__20_140805/} }