Pavlova, Svetlana, and Alina Zadorozhnia. “ANALYSIS OF FREE ROUTE AIRSPACE AND PERFORMANCE BASED NAVIGATION IMPLEMENTATION IN THE EUROPEAN AIR NAVIGATION SYSTEM”. Proceedings of National Aviation University 61, no. 4 (December 10, 2014): 28–35. Accessed April 19, 2024. https://jrnl.nau.edu.ua/index.php/visnik/article/view/7583.