Cartwright, R. A.; Roberts, E. A. H. (1954). “Theogallin, a polyphenol occurring in tea”. Journal of the Science of Food and Agriculture5 (12): 593. doi:10.1002/jsfa.2740051207.
Dimpfel, Wilfried; Kler, Adolf; Kriesl, Erwin; Lehnfeld, Romanus (2007). “Theogallin and l-theanine as active ingredients in decaffeinated green tea extract: II. Characterization in the freely moving rat by means of quantitative field potential analysis”. Journal of Pharmacy and Pharmacology59 (10): 1397–403. doi:10.1211/jpp.59.10.0010. PMID17910815.
Dimpfel, Wilfried; Kler, Adolf; Kriesl, Erwin; Lehnfeld, Romanus (2007). “Theogallin and l-theanine as active ingredients in decaffeinated green tea extract: II. Characterization in the freely moving rat by means of quantitative field potential analysis”. Journal of Pharmacy and Pharmacology59 (10): 1397–403. doi:10.1211/jpp.59.10.0010. PMID17910815.