Hassan AB, Ali HM, Rabee RF. Comparison of Optimum Balance Values For Different Coefficients of Spherical Aberration of Optical System Including Different Apertures. IHJPAS [Internet]. 2017 Aug. 9 [cited 2025 Apr. 3];22(3). Available from: https://jih.uobaghdad.edu.iq/index.php/j/article/view/1219