Pinzón, Tito Morales, and Jhon Jairo Arias. 2013. “Vehicle Pollution in the Pereira-Dosquebradas Conurbation”. Revista Luna Azul (On Line), no. 37 (July):101-29. https://revistasojs.ucaldas.edu.co/index.php/lunazul/article/view/1678.