ŠVADLENKA, Libor; CHLAN, Aleksander. Principles of the Proposed Czech Postal Sector Price Control Model. Promet - Traffic&Transportation, [S. l.], v. 21, n. 1, p. 33–40, 2009. DOI: 10.7307/ptt.v21i1.910. Disponível em: https://traffic2.fpz.hr/index.php/PROMTT/article/view/1489. Acesso em: 26 aug. 2025.