Sampanvejsobha, S., S. Siriwattanayotin, N. Rungraeng, and P. Wongsa. “Separation of Polyphenol Compounds and Caffeine from Green Tea Extract”. Asia-Pacific Journal of Science and Technology, vol. 21, no. 2, July 2016, pp. 150-5, doi:10.14456/kkurj.2016.16.