Yap, Xien Yin, Kim Seng Chia, Hisyam Abdul Rahman, and Vicent Teh. “A Non-Destructive Oil Palm Fruit Freshness Prediction System With Artificial Neural Network”. International Journal of Integrated Engineering 11, no. 8 (December 30, 2019): 159–163. Accessed July 6, 2022. https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/3170.