Full reference OpenMind biblio ref
Schmidl, Petra. 2007. “Ashraf: Al‐Malik al‐Ashraf (Mumahhid al‐Dīn) ʿUmar Ibn Yūsuf Ibn ʿUmar Ibn ʿAlī Ibn Rasūl”. In The Biographical Encyclopedia of Astronomers, ed. Thomas al., 1:66-7. New York: Springer-Verlag.
{ Petra Schmidl, Thomas al., 2007 #11748 }