M. Ibrahim, Ragheed, رغید, Erada A. Al-Dabbagh, and ارادة. “Influence of Optical Feedback on Frequency Response of GaAs / AlGaAs Quantum Cascade Laser”. Journal of Education and Science (JES) 23, no. 2 (June 1, 2010): 56–63. Accessed August 4, 2025. https://rjps.uomosul.edu.iq/index.php/edusj/article/view/17056.