Paweska, Marcin, Dmytro Bugayko, Mariia Grigorak, and Robert Mendrun. “TRANSPORT LAW AND THE CERTIFICATION PROCESS IN POLAND AND EUROPEAN UNION”. Proceedings of National Aviation University 57, no. 4 (January 21, 2014): 151–154. Accessed May 3, 2024. https://jrnl.nau.edu.ua/index.php/visnik/article/view/5598.