1. Official Methods of Analysis of the Association of Official Analytical Chemists, ed. Horwitz W., Association of Official Analytical Chemists, Arlington, VA, 15th edn., 1990, sect. 930.28.
2. Automated determination of fat, crude protein and lactose in ewe milk by infrared spectrometry
3. International Dairy Federation, Standard 28A: Determination of the Lactose Content of Milk, International Dairy Federation, Brussels, 1974.