T. Abdul Rahman, Zeina, زینة, Zeyad T. Ahmed, and زیاد. “Study of Resonator Properties of Stable and Unstable Lasers”. Journal of Education and Science (JES) 28, no. 4 (December 1, 2019): 240–250. Accessed August 4, 2025. https://rjps.uomosul.edu.iq/index.php/edusj/article/view/17259.