Almaguer, Cynthia, Frithjof Thiele, Christina Schönberger, and Elke Arendt. 2015. “Ultrastructure Studies of the Lupulin Glands of Different Hop (Humulus Lupulus L.) Varieties Observed by Scanning Electron Microscope”. BrewingScience 68 (11/12): 153-60. https://brewingscience.de/index.php/brewingscience/article/view/325.