Ibrahim Abdullah, Abdulghafoor, and عبدالغفور. “Laser Field Distribution Dependence on The Missing Holes of Photonic Crystal Fiber”. Journal of Education and Science (JES) 22, no. 2 (June 1, 2009): 114–126. Accessed August 4, 2025. https://rjps.uomosul.edu.iq/index.php/edusj/article/view/17484.