Nunumvong, Vakin, Kosin Teeparuksapun, Nicha Prasongchan, and Apichai Phonchai. 2024. “A portable RGB color sensor for detecting free fatty acid (FFA) in palm oil samples”. Asia-Pacific Journal of Science and Technology 29 (06):APST-29. https://doi.org/10.14456/apst.2024.92.