A. J. Haider and M. F. J, “Effect of Gaussian Aperture Width on Visibility for Different Crystal Length”, Al-Nahrain J. Sci., vol. 14, no. 2, pp. 109–115, Jun. 2011, Accessed: May 22, 2026. [Online]. Available: https://anjs.edu.iq/index.php/anjs/article/view/893