Auguściuk, Elżbieta, and Grzegorz Biniecki. “Investigation of Parameters of the Multimode Four-Layer Waveguide Structures and Their Influence on the Light Propagation”. Photonics Letters of Poland 1, no. 3 (September 30, 2009): pp. 124–126. Accessed November 20, 2024. http://m.photonics.pl/PLP/index.php/letters/article/view/1-42.