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«Procyanidin content and variation in some commonly consumed foods». The Journal of Nutrition130 (8S Suppl): 2086S–2092S. August 2000. doi:10.1093/jn/130.8.2086S. PMID10917927.
«Impact of fermentation, drying, roasting, and Dutch processing on epicatechin and catechin content of cacao beans and cocoa ingredients». Journal of Agricultural and Food Chemistry58 (19): 10518–10527. October 2010. doi:10.1021/jf102391q. PMID20843086.