NEELAMEGHAN, A.; GOPINATH, M. A. Transport Economics:Depth Classification Version of CC. Journal of Information and Knowledge, [S. l.], v. 7, n. 4, p. 314–352, 1970. DOI: 10.17821/srels/1970/v7i4/54486. Disponível em: https://srels.org/index.php/sjim/article/view/54486. Acesso em: 8 apr. 2025.