Mohammed Belkebir, S., B. . Khelidj, and M. Tahar-Abbes. “Study of the Combustion Process of a Homogeneous Charge Compression Ignition (HCCI) Engine and a Partially Premixed Combustion (PPC) Mode of a Compression Ignition Engine Using Natural Gas As an Alternative Fuel”. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, vol. 84, no. 2, July 2021, pp. 98-115, doi:10.37934/arfmts.84.2.98115.