Pöschl, Moritz, et al. “The Influence of Fermentation-Control on the Colloidal Stability and the Reducing Power of the Resulting Bottom Fermented Beers”. BrewingScience, vol. 60, no. 7/8, Aug. 2007, pp. 96-109, https://brewingscience.de/index.php/brewingscience/article/view/444.