N. N. Mohd Kahar and Z. Embong, “Classification of Malaysian Soil Species Based on FTIR and Laser Raman Spectroscopy Analysis”, EKST, vol. 2, no. 2, pp. 373–383, Nov. 2022, Accessed: Jul. 21, 2024. [Online]. Available: https://penerbit.uthm.edu.my/periodicals/index.php/ekst/article/view/5499