L. Seigner, A. Lutz, and E. Seigner, “Monitoring of Important Virus and Viroid Infections in German Hop (Humulus lupulus L.) Yards”, BrSc, vol. 67, no. 5/6, pp. 81–87, Jun. 2014, Accessed: May 30, 2026. [Online]. Available: https://brewingscience.de/index.php/brewingscience/article/view/365