Chaichan, M.T. and 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), pp. 11–20. Available at: https://www.alkej.uobaghdad.edu.iq/index.php/alkej/article/view/485 (Accessed: 19 July 2026).