S. Wunderlich, M. Biendl, A. Zürcher, and W. Back, “Reduced Xanthohumol Recovery after Solid Phase Extraction of Dark Beers”, BrSc, vol. 62, no. 7/8, pp. 95–99, Aug. 2009, Accessed: Jun. 25, 2026. [Online]. Available: https://brewingscience.de/index.php/brewingscience/article/view/472