1. Analytical methods for dry milk products;Niro,1978
2. Powder bulk volume;GEA,2006
3. ISO 8968-2| IDF 20-2 Milk–Determination of Nitrogen content. Part 1: Kjeldahl Method and Part 2: Block-digestion Method (Macro Method), Standard 20B;ISO,2001
4. ISO 1211-IDF 1 Milk – Determination of fat content – Gravimetric method (reference method);ISO,2010