Panthakant Janepinich, Chutimon Satirapipathkul, Naparat Kasetsomboon, and Piyaphong Yongphet. “Enhancing lutein extraction from marigolds through ultrasound-assisted optimization using response surface methodology”. Maejo International Journal of Energy and Environmental Communication 5, no. 1 (February 20, 2023): 14–19. accessed October 14, 2026. https://ph02.tci-thaijo.org/index.php/MIJEEC/article/view/248359.