Varju, P. “Determination of the Soluble Iron Content of Filter Aids. A Collaborative Trial: Submitted on Behalf of the Analysis Committee of the European Brewery Convention”. BrewingScience 49, no. 7/8 (August 30, 1996): 244–245. Accessed May 31, 2026. https://brewingscience.de/index.php/brewingscience/article/view/763.