LACHENMEIER, Dirk W.; TRIEBEL, Sven; LERCH, Eric. Bitterness Units in beer: retrospective trends and current concept of commerce. BrewingScience, [S. l.], v. 60, n. 11/12, p. 1–2, 2006. Disponível em: https://brewingscience.de/index.php/brewingscience/article/view/502. Acesso em: 30 may. 2026.