JOURNAL, B. S. Calculation of Coefficients of Cassegrain Telescope Mirrors: Ahmed Kamil Ahmed. مجلة بغداد للعلوم, Iraq, Baghdad, v. 8, n. 1, p. 161-167, 2011. DOI: 10.21123/bsj.2011.8.1.161-167. Disponível em: https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/1148. Acesso em: 21 2021.