Among them, a Turk from Central Asia, Ali Kuscu, was one of the finest mathematicians and astronomers of his epoch. In: Amir Hasan Siddiqi: Cultural centres of Islam. Jamiyat-ul-Falah Publications, 1970, S.90 (Google Books).
During the fifteenth century this method of representing decimal fractions came to be known outside the Islamic world as the Turkish method, after a Turkish colleague of al-Kashi, known as Ali Qushji, who provided an explanation. In: George Gheverghese Joseph: The crest of the peacock: non-European roots of mathematics. Princeton University Press, 2010, ISBN 978-0-691-13526-7, S. 469.
Greaves quotes from Risala dar 'ilm al-Hay’a of 'Ali b. Muh. 'Ala al-Din Qushji. This Persian author was the son of an official of Ulugh Beg, and also a student of Qadi Zadeh. In: G. A. Russell: The 'Arabick' Interest of the Natural Philosophers in Seventeenth-century England. Brill, Leiden 1994, ISBN 90-04-09888-7, S. 162.