Paweska M, Bugayko D, Grigorak M, Mendrun R. TRANSPORT LAW AND THE CERTIFICATION PROCESS IN POLAND AND EUROPEAN UNION. Proceedings of National Aviation University [Internet]. 2014 Jan. 21 [cited 2024 May 3];57(4):151-4. Available from: https://jrnl.nau.edu.ua/index.php/visnik/article/view/5598