ISO 8968-1:2001 Lait - Détermination de la teneur en azote - Partie 1: Méthode Kjeldahl (Deuxième édition)
ISO 8968-2:2001 Milk - Determination of nitrogen content - Part 2: Block-digestion method (Macro method)
ISO 8968-4:2001 Milk - Determination of nitrogen content - Part 4: Determination of non-protein-nitrogen content
EN ISO 8968-5:2001 history
2001EN ISO 8968-5:2001 Milk - Determination of nitrogen content - Part 5: Determination of protein-nitrogen content (ISO 8968-5:2001)
EN ISO 8968-5:2001 Milk - Determination of nitrogen content - Part 5: Determination of protein-nitrogen content (ISO 8968-5:2001) was changed to EN ISO 8968-4:2016 Milk and milk products - Determination of nitrogen content - Part 4: Determination of protein and non-protein nitrogen content and true protein content calculation (Reference method).