Ahmad, R., M. A. M. Ishak, K. Ismail, and N. N. Kassim. “Influence of Microwave Pre-Treated Palm Kernel Shell and Mukah Balingian Coal on Co-Gasification”. Journal of Mechanical Engineering and Sciences, vol. 13, no. 4, Dec. 2019, pp. 5791-03, doi:10.15282/jmes.13.4.2019.06.0462.