M. V. Shkayeva, P. J. Gregory, M. K. Pickering, D. J. Hein, J. Hu, and A. Rodriguez, “Green Tea Product Epigallocatechin Gallate (EGCG) Content and Label Information: A Descriptive Analysis”, J. Nutr. Ther., vol. 4, no. 3, pp. 81–84, Oct. 2015.