Afrah, B. D., M. I. Riady, P. Payomthip, R. V. Ramadhanty, F. Rizki, and M. L. Alfayyadh. “Analysis of Liquid Smoke Grade Characteristics from Coconut Shells and Palm Kernel Shell Waste Through a Slow Pyrolysis Process”. Journal of Engineering and Technological Sciences, vol. 56, no. 4, Aug. 2024, pp. 545-58, doi:10.5614/j.eng.technol.sci.2024.56.4.10.