Full reference OpenMind biblio ref
Rozenfeld, Boris. 1993. “‘Geometric Trigonometry’ in Treatises of Al-Khwārizmī, Al-Māhānī, and Ibn Al-Haytham”. In Vestigia Mathematica, Studies in Medieval and Early Modern Mathematics in Honour of H. L. L. Busard, eds. Menso Folkerts and Jan Hogendijk, 305-8. Amsterdam; Atlanta: Rodopi.
{ Menso Folkerts, Jan Hogendijk, Boris Rozenfeld, 1993 #10301 }