“Studying the Pattern Modes of the Optical Fiber of the Laser and Comparing It With Pattern Modes of Graduated Fiber in Terms of the Ellipse Function (V)”. Latakia University Journal -Basic Sciences Series 41, no. 1 (February 28, 2019). Accessed October 20, 2026. https://journal.latakia-univ.edu.sy/index.php/bassnc/article/view/8473.