“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)”, TUJ-BA, vol. 41, no. 1, Feb. 2019, Accessed: May 04, 2026. [Online]. Available: https://journal.latakia-univ.edu.sy/index.php/bassnc/article/view/8473