สิงหศิริ ธ. Optimization for Biodiesel Production from Waste Chicken Fat Using Ultrasonic Assisted in Transesterification. KKU Sci. J. [internet]. 2015 Dec. 30 [cited 2025 Apr. 26];43(4):738-4. available from: https://ph01.tci-thaijo.org/index.php/KKUSciJ/article/view/249449