M.M. Ameen, Sabah M.M. Ameen, and Mansour H. Mansour. “A Simple and General Analytical Expression for Calculating Crosstalk in Multiwaveguide Directional Couplers Using Finite Differences Method”. Journal of Kufa-Physics 11, no. 02 (January 27, 2020): 6–14. Accessed August 7, 2026. https://journal.uokufa.edu.iq/index.php/jkp/article/view/7395.