2021. EXHAUST GAS RECIRCULATION EFFECT ON COMBUSTION AND EMITTED NOX IN A SPARK IGNITION ENGINE USING HIGH OCTANE NUMBER FUEL. THE IRAQI JOURNAL FOR MECHANICAL AND MATERIALS ENGINEERING. 21, 2 (Jun. 2021), 80–95. DOI:https://doi.org/10.32852/iqjfmme.v21i2.545.