Gabel, Lorenz, Karl Glas, Fritz Jacob, Albrecht Friess, and Harun Parlar. “Efficient Formation of Iso-Humulones in Aqueous Hop Solutions at Low Temperatures”. BrewingScience 61, no. 1/2 (February 29, 2008): 25–31. Accessed May 30, 2026. https://brewingscience.de/index.php/brewingscience/article/view/432.