Serpa, G., Zumba, X., Montalvo, F., Baño, D., Martinez, J. and Zambrano, I. 2019. Influence of the type of spark plug in the evaluation of the performance and emissions caused in an ignition engine. Enfoque UTE. 10, 2 (Jun. 2019), pp. 115 - 125. DOI:https://doi.org/10.29019/enfoque.v10n2.465.