Antamba Guasgua, Jaime, Guillermo Reyes Campaña, and Miguel Granja Paredes. 2016. “Comparative Study of Emission of Pollutant Gases in Vehicle M1, Using Fuel of the Andean Community”. Enfoque UTE 7 (3), pp. 110 - 119. https://doi.org/https://doi.org/10.29019/enfoqueute.v7n3.109.