KAMPF, R.; VELECHOVSKÝ, M. TRANSPORTATION SYSTEM ALTERNATIVES. Perner’s Contacts, [S. l.], v. 6, n. 2, p. 68–73, 2011. Disponível em: https://pernerscontacts.upce.cz/index.php/perner/article/view/829. Acesso em: 24 dub. 2024.