N. M. H. Nik Ab Rashid, 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”, J. Mech. Eng. Sci., pp. 9689–9699, Dec. 2023, doi: 10.15282/jmes.17.4.2023.3.0767.