1. Urgert R, Essed N, van der Weg G, Kosmeijer-Schuil TG, Katan MB: Separate effects of the coffee diterpenes cafestol and kahweol on serum lipids and liver aminotransferases. Am J Clin Nutr. 1997 Feb;65(2):519-24. doi: 10.1093/ajcn/65.2.519. [PubMed:9022539 ]
  2. Speer, K., Hruschka, A., Kurzrock, T. and K├Âlling-Speer, I. (2000). 25. In Caffeinated Beverages. Health benefits, physiological effects, and chemistry (pp. 241-251). ACS Symposium series 754. [ISBN:0-841-3654-2 ]