Dueñas-Ruiz, Domingo Ernesto, and Henry Jaimes-Monsalve. “Methods to Determine the Quality of the Urban Bus Service”. Revista UIS Ingenierías 7, no. 2 (December 3, 2008). Accessed August 24, 2024. https://revistas.uis.edu.co/index.php/revistauisingenierias/article/view/60.