DescriptionNielsHenrikAbelsignature.png Norsk bokmål: NielsHenrikAbels signatur. Date Unknown date Unknown date Source C. A. Bjerknes: Niels-HenrikAbel :
DescriptionNielsHenrik Abel2.jpg Drawing of the famous Norwegian mathematician NielsHenrikAbel, with his signature Source English Wikipedia (en:Image:Niels Henrik