Hakan Aktas, A. and Pekcan, H. 2013. Chemometric Methods for the Simultaneous Spectrophotometric Determination of Caffeine, Theobromine and Theophylline in Tea. Asian Journal of Chemistry. 25, 15 (Sep. 2013), 8333–8338. DOI:https://doi.org/10.14233/ajchem.2013.14735.