Zubornyák, Barna, and Tímea Vas. “ TRM, or How to Improve Competencies of Air Traffic Controllers and Its Potencial Utilization in a Multinational Cooperation”. Aeronautical Science Bulletins, vol. 26, no. 2, Aug. 2014, pp. 171–179, https://folyoirat.ludovika.hu/index.php/reptudkoz/article/view/4609.