A. Shamsudeen, S. Abdullah, A.K. Ariffin, M.R.M. Rasani and Y. Ali. “Design and Simulation of a Cylinder Head Structure for A Compressed Natural Gas Direct Injection Engine”. International Journal of Automotive and Mechanical Engineering, vol. 9, Dec. 2022, pp. 1620-9, doi:10.15282/ijame.9.2013.12.0134.