Johnson, B. A., and C.-G. Johansson. “Determination of the Total Soluble Nitrogen Content of Malt and Beer by the Dumas Combustion Method: Collaborative Trial: Submitted on Behalf of the Analysis Committee of the Institute of Brewing and the Analysis Committee of the European Brewery Convention”. BrewingScience 53, no. 3/4 (April 29, 2000): 50–53. Accessed May 30, 2026. https://brewingscience.de/index.php/brewingscience/article/view/665.