BIBLIOGRAPHY REFERENCE: BOOK ʿUmar Khayyām al-Hakīm al-Falakī al-Nishāpūrī Author Ahmad Al-Sarraf (Author) Year of Publication 1949 City Baghdad Other Numbers 11502 See reference for OpenMind ISMI items with this reference Person: Ġiyāṯ al-Dīn Abū al-Fatḥ ʿUmar ibn Ibrāhīm al-Ḫayyāmī al-Nīšāpūrī