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2. [Determination of catechins and caffeine in tea and tea beverages by high-performance liquid chromatography]. Ling Y, Zhao YF, Li ZJ, Zhang G, Wu Y. Wei Sheng Yan Jiu; 2005 Mar; 34(2):187-90. PubMed ID: 15952660 [Abstract] [Full Text] [Related]
4. High pressure liquid chromatographic determination of theobromine and caffeine in cocoa and chocolate products. Kreiser WR, Martin RA. J Assoc Off Anal Chem; 1978 Nov; 61(6):1424-7. PubMed ID: 730647 [Abstract] [Full Text] [Related]