“Evaluating the Optical Properties of the Schmidt Cassegrain Spider Obscuration Telescope Using Zemax Program”. Ibn AL-Haitham Journal For Pure and Applied Sciences 35, no. 4 (October 20, 2022): 66–75. Accessed May 1, 2024. https://jih.uobaghdad.edu.iq/index.php/j/article/view/2768.