Chaichan, M. T., & Abass, Q. A. (2010). Study of NOx Emissions of S.I. Engine Fueled with Different Kinds of Hydrocarbon Fuels and Hydrogen. Al-Khwarizmi Engineering Journal, 6(2), 11-20. https://www.alkej.uobaghdad.edu.iq/index.php/alkej/article/view/485