Masood Mohamad, Huda, هدى, Abdulghafoor Ibrahim Abdullah, and عبد. “The Influence Of Hole Radius On The Properties Of Photonic Crystal Fiber”. Journal of Education and Science (JES) 21, no. 4 (December 1, 2008): 76–87. Accessed August 4, 2025. https://rjps.uomosul.edu.iq/index.php/edusj/article/view/18255.