Zhumazhanov, B. R., Murzakulov, G. T., Nurguzhin, M. R., & Albazarov, B. S. (2013). Modern methods of design and analysis of optical systems on example of the off-axis catadioptric system. Recent Contributions to Physics, 44(1), 95-100. https://bph.kaznu.kz/index.php/zhuzhu/article/view/75