Kacik, Daniel, Ivan Martincek, Dusan Pudis, Norbert Tarjanyi, and Ivan Turek. “Photonic Crystals – Optical Structures for Advanced Technology”. Communications - Scientific letters of the University of Zilina 10, no. 2 (June 30, 2008): 25-29. Accessed April 6, 2026. http://journals.uniza.sk/index.php/communications/article/view/1041.