Nurguzhin, M., A. Kaliyev, and B. Z. Zhumazhanov. “Modern Methods of Design and Analysis of Optical Systems on Example of the off-Axis Catadioptric System”. Recent Contributions to Physics, vol. 2014, no. 1, May 2014, pp. 80-86, https://bph.kaznu.kz/index.php/zhuzhu/article/view/763.