BACK, Werner; IMAI, Takeo; FORSTER, Clemens; NARZISS, Ludwig. Hefevitalität und Bierqualität. BrewingScience, [S. l.], v. 51, n. 11/12, p. 189–195, 1998. Disponível em: https://brewingscience.de/index.php/brewingscience/article/view/694. Acesso em: 30 may. 2026.