POLO, Gerardo. On maritime transport costs, evolution, and forecast. Ciencia y tecnología de buques, [S. l.], v. 5, n. 10, p. 19–31, 2012. DOI: 10.25043/19098642.57. Disponível em: https://shipjournal.co/index.php/sst/article/view/57. Acesso em: 24 apr. 2024.