Dr.A Narsaiah, B.Srinivasa Goud, Dr.T.Kiran Kumar. “PRIMARY SPHERICAL ABERRATION WITH TWO-ZONE APERTURES”. EPRA International Journal of Research and Development (IJRD) 9, no. 2 (February 29, 2024): 278–280. Accessed July 3, 2024. https://eprajournals.net/index.php/IJRD/article/view/3872.