A. B. Hassan, H. M. Ali, and R. F. Rabee, “Comparison of Optimum Balance Values For Different Coefficients of Spherical Aberration of Optical System Including Different Apertures”, IHJPAS, vol. 22, no. 3, Aug. 2017, Accessed: Apr. 03, 2025. [Online]. Available: https://jih.uobaghdad.edu.iq/index.php/j/article/view/1219