Chew, Lee Chie, and Syed Zuhaib Haider Rizvi. “Heavy Metal Detection in Medicinal Herbs Using Laser-Induced Breakdown Spectroscopy”. Enhanced Knowledge in Sciences and Technology 2, no. 2 (November 29, 2022): 156–166. Accessed April 8, 2026. https://penerbit.uthm.edu.my/periodicals/index.php/ekst/article/view/5442.