Luppo, Alexandr, Vitaliy Lazorenko, and Oleksandr Prygara. “IMPLEMENTATION OF LOCAL AND SUB-REGIONAL AIRSPACE MANAGEMENT SUPPORTING SYSTEM IN UKRAINE”. Proceedings of National Aviation University (archive) 56, no. 3 (October 1, 2013): 29–33. Accessed April 25, 2026. http://jrnl.kai.edu.ua/index.php/visnik/article/view/5413.