Tan WJ, Ariff ZM, Rusli A, Musa MS. A Modular, 3D-Printed, and Cost-Effective Near-Infrared Spectrometer with Machine Learning for Commodity Plastic Identification. IIUMEJ [Internet]. 2026 Sep. 11 [cited 2026 Sep. 13];27(3):403-15. Available from: https://journals.iium.edu.my/ejournal/index.php/iiumej/article/view/4388