Maciel, M. S. D., Úrsula G. R. Maruyama, and A. M. C. das Neves. “Issues and Trends on Sustainable Transportation: The Case of Brazilian Cities (2003-2010)”. Brazilian Journal of Operations & Production Management, vol. 10, no. 2, Jan. 2014, pp. 43-56, https://bjopm.org.br/bjopm/article/view/V10N2A5.