siramon, pornpun, T. . Wongsheree, and S. . Yuadyong. “Ultrasound-Assisted Extraction of Phenolic Compounds from Coconut Endocarp and Its Radical Scavenging Activity”. Health Science, Science and Technology Reviews, vol. 13, no. 3, Dec. 2020, pp. 22-28, https://li01.tci-thaijo.org/index.php/journalup/article/view/245449.