Khidhir, Ali Hassan. “Optimum Diameter for Laser Beam and Effect of Temperature Rise on the Optical Bistability Hysteresis Loops”. Iraqi Journal of Physics 18, no. 45 (June 1, 2020): 32–39. Accessed May 2, 2025. https://www.ijp.uobaghdad.edu.iq/index.php/physics/article/view/520.