P. P. Peláez, I. Bardón, and P. Camasca, “Methylxanthine and catechin content of fresh and fermented cocoa beans, dried cocoa beans, and cocoa liquor”, Sci. agropecu, vol. 7, no. 4, pp. 355–365, Dec. 2016, doi: 10.17268/sci.agropecu.2016.04.01.