Frischknecht, P. M.; Ulmer-Dufek, Jindra; Baumann, Thomas W. (1986). «Purine formation in buds and developing leaflets of Coffea arabica: expression of an optimal defence strategy?». Journal of the Phytochemical Society of Europe and the Phytochemical Society of North America. Phytochemistry. 25 (3): 613–6. doi:10.1016/0031-9422(86)88009-8
Nathanson, J. A. (1984). «Caffeine and related methylxanthines: possible naturally occurring pesticides». Science. 226 (4671): 184–7. PMID6207592. doi:10.1126/science.6207592
Nathanson, J. A. (1984). «Caffeine and related methylxanthines: possible naturally occurring pesticides». Science. 226 (4671): 184–7. PMID6207592. doi:10.1126/science.6207592