Naṣīr al-Dīn al-Ṭūsī's Memoir on astronomy : al-tadhkira fī ʻilm al-hayʼa - Ṭūsī, Naṣīr al-Dīn Muḥammad ibn Muḥammad, 1201-1274 (Sources in the history of mathematics and physical sciences, 1993)