Cvengroschová, Mariana, Gabriela Šepeľová, and Daniela Šmogrovičová. 2003. “Effect of Mashing-in Temperature on Free Amino Nitrogen Concentration and Foam Stability of Beer”. BrewingScience 56 (7/8): 128-31. https://brewingscience.de/index.php/brewingscience/article/view/573.