Suwannarat, S., Khaorapapong , T. and Chongcheawchamnan, M. (2012) “Prediction of Oil Content in Fresh Palm Fruit based on an Ultrasonic Technique”, Agriculture and Natural Resources. Bangkok, Thailand, 46(2), pp. 318–324. available at: https://li01.tci-thaijo.org/index.php/anres/article/view/242817 (accessed: 2 September 2026).