Bogunenko, Nikolay, and Yulia Semydko. “IMPLEMENTATION OF THE GREEN FLIGHT INTO AIRSPACE OF UKRAINE”. Proceedings of National Aviation University 61, no. 4 (December 10, 2014): 65–70. Accessed December 21, 2024. https://jrnl.nau.edu.ua/index.php/visnik/article/view/7588.