Somnuk, K., Smithmaitrie , P., & Prateepchaikul, G. (2012). Feasibility of Using Ultrasound-Assisted Biodiesel Production from Degummed-Deacidifi ed Mixed Crude Palm Oil Using Small-Scale Circulation. Agriculture and Natural Resources, 46(4), 662–669. retrieved from https://li01.tci-thaijo.org/index.php/anres/article/view/242920