Nik Ab Rashid, N. M. H., A. A. Hairuddin, K. A. Md Rezali, S. U. Masuri, and M. A.A.Mossa. “Numerical Study of Piston Bowl Geometries on PFI-HCCI Engine Performance”. Journal of Mechanical Engineering and Sciences, Dec. 2023, pp. 9689-9, doi:10.15282/jmes.17.4.2023.3.0767.