BIBLIOGRAPHY CONTRIBUTOR Gregg DeYoung First name Gregg Last name DeYoung Bibliography entries by this contributor DeYoung, Gregg. 2007. “Cholgi: Maḥmūd Shāh Cholgi”. In The Biographical Encyclopedia Of Astronomers, ed. Thomas al., 1:231. New York: Springer-Verlag. DeYoung, Gregg. 2007. “Farghānī: Abū Al-ʿAbbās Aḥmad Ibn Muḥammad Ibn Kathīr Al-Farghānī”. In The Biographical Encyclopedia Of Astronomers, ed. Thomas Hockey, 1:357. New York: Springer-Verlag. DeYoung, Gregg. 2007. “Nayrīzī: Abū Al‐ʿAbbās Al‐Faḍl Ibn Ḥātim Al‐Nayrīzī”. In The Biographical Encyclopedia Of Astronomers, ed. Thomas Hockey, 823. New York: Springer-Verlag. DeYoung, Gregg. 1997. “Al-Jawharī's Additions To Book V Of Euclid's Elements”. Zeitschrift Für Geschichte Der Arabisch-Islamischen Wissenschaften 11: 153-178. DeYoung, Gregg. 1994. “Ibn Al-Sari On Ex Aequali Ratios: His Critique Of Ibn Al-Haytham And His Attempt To Improve The Parallelism Between Books V And Vii Of Euclid's 'Elements'”. Zeitschrift Für Geschichte Der Arabisch-Islamischen Wissenschaften, 99-152. DeYoung, Gregg. 1984. “The Arabic Textual Traditions Of Euclid’s Elements”. Historia Mathematica 11: 147-60.