Birkos, Konstantinos, Theofilos Chrysikos, and Stavros Kotsopoulos. “QoS Issues in Complex-Based High Altitude Platform Communication Systems”. Communications - Scientific letters of the University of Zilina 9, no. 4 (December 31, 2007): 5-9. Accessed April 6, 2026. http://journals.uniza.sk/index.php/communications/article/view/1146.