Macheiner, Lukas; Schmidt, Anatol; Schreiner, Matthias; Mayer, Helmut K. (2019). "Green coffee infusion as a source of caffeine and chlorogenic acid". Journal of Food Composition and Analysis. 84: 103307. doi:10.1016/j.jfca.2019.103307. S2CID202882087.
Macheiner, Lukas; Schmidt, Anatol; Schreiner, Matthias; Mayer, Helmut K. (2019). "Green coffee infusion as a source of caffeine and chlorogenic acid". Journal of Food Composition and Analysis. 84: 103307. doi:10.1016/j.jfca.2019.103307. S2CID202882087.