Lachenmeier, D.W., Triebel, S. and Lerch, E. (2006) “Bitterness Units in beer: retrospective trends and current concept of commerce”, BrewingScience, 60(11/12), pp. 1–2. Available at: https://brewingscience.de/index.php/brewingscience/article/view/502 (Accessed: 30 May 2026).