SCHILIEPHAKE, Konard; TIETZE, Wolf. Passenger Transport by Air. Promet - Traffic&Transportation, [S. l.], v. 11, n. 2-3, p. 75–82, 2012. Disponível em: https://traffic2.fpz.hr/index.php/PROMTT/article/view/2319. Acesso em: 27 aug. 2025.