AVENDAÑO CÁRDENAS, David Bernardo; SALTO SIMBAÑA, Mayra Alejandra; ASTUDILLO, Rómulo. Analysis of the Opacity Level of the Urban Bus Fleet of Cooperativa Uncometro S.A. Revista Tecnológica - ESPOL, Guayaqui, EC, v. 32, n. 2, p. 89–94, 2020. DOI: 10.37815/rte.v32n2.716. Disponível em: https://rte.espol.edu.ec/index.php/tecnologica/article/view/716. Acesso em: 2 nov. 2025.