JASSEM, sarmad A.; HANOON, R. M. Effect of Hydrogen Fuel Used in Internal Combustion Engine to Improve the Efficiency of Spark Ignition Engine. Journal of Petroleum Research and Studies, [S. l.], v. 15, n. 4, p. 144-164, 2025. DOI: 10.52716/jprs.v15i4.983. Disponível em: https://jprs.gov.iq/index.php/jprs/article/view/983. Acesso em: 23 dec. 2025.