Kamkayan, Pichanan, and Kitipong Assatarakul. 2021. “Effect of single-factor by ultrasound-assisted extraction on antioxidant properties of extract from jiaogulan (Gynostemma pentaphyllum) leaves”. Journal of Food Technology, Siam University 16 (2):95-108. https://li01.tci-thaijo.org/index.php/JFTSU/article/view/248386.