Murzakulov, G., M. Nurguzhin, B. Albazarov, and B. Zhumazhanov. “Modern Methods of Design and Analysis of Optical Systems on Example of the off-Axis Catadioptric System”. Recent Contributions to Physics, vol. 2013, no. 1, Mar. 2013, pp. 95-100, https://bph.kaznu.kz/index.php/zhuzhu/article/view/739.