Yen, Dang Thi Kim, and Nguyen Vu Hong Ha. 2018. “Effects of Maturity Stages and Fermentation of Cocoa Beans on Total Phenolic Contents and Antioxidant Capacities in Raw Cocoa Powder”. Vietnam Journal of Biotechnology 14 (4):743-52. https://doi.org/10.15625/1811-4989/14/4/12309.