List of Articles Optimum Spark Advance Open Access Article Abstract Page Full-Text 1 - Experimental Study and Comparison of a Few Lean (gasoline-natural gas) Dual Fuels Based on Safe Optimum Spark Advance سیدکاظم یکانی ابراهیم عبدی اقدم مهرداد سرابی 10.30495/ijim.2022.19651