TEPSATIAN, P., and K. KITTIGOWITTANA. “Encapsulation Efficiency of Oolong Tea Chitosan Nanoparticles for Cosmetic Applications”. Walailak Journal of Science and Technology (WJST), vol. 14, no. 9, July 2016, pp. 677-85, https://wjst.wu.ac.th/index.php/wjst/article/view/2828.