DRDLA, P. .; BULÍČEK, J. . FARE COLLECTION SYSTEM IN INTEGRATED PUBLIC PASSENGER TRANSPORT SYSTEMS. Perner’s Contacts, [S. l.], v. 7, n. 2, p. 22–33, 2012. Disponível em: https://pernerscontacts.upce.cz/index.php/perner/article/view/1137. Acesso em: 4 úno. 2023.