KMITA, E. Professional competence of air traffic controller in the sphere of subject-activity approach. Journal of Education, Technology and Computer Science, [S. l.], n. 1, p. 204–209, 2013. DOI: 2080-9069. Disponível em: https://journals.ur.edu.pl/jetacomps/article/view/6833. Acesso em: 22 lip. 2024.