Abd Al-Majeed KH, Hasan AB, Aldeen SHR. Evaluation of Optical Efficiency of Circular Cross-Section Torus Waveguide via Changing the Optical Parameters. IHJPAS [Internet]. 2025 Apr. 20 [cited 2025 Apr. 22];38(2):102-14. Available from: https://jih.uobaghdad.edu.iq/index.php/j/article/view/3932