Full reference OpenMind biblio ref
Hogendijk, Jan. 1986. “Discovery of an 11th-Century Geometrical Compilation: The Istikmāl of Yūsuf Al-Muʾtaman Ibn Hūd, King of Saragossa”. Historia Mathematica 13 (1): 43-52.
{ Jan Hogendijk, 1986 #11340 }