C. Almaguer, M. Gastl, E. K. Arendt, and T. Becker, “Contributions of Hop Hard Resins to Beer Quality”, BrSc, vol. 65, no. 7/8, pp. 118–129, Aug. 2012, Accessed: May 30, 2026. [Online]. Available: https://brewingscience.de/index.php/brewingscience/article/view/398