1. Animal and Vegetable Fats and Oils-Determination of Acid Value and of Acidity International Organization for Standardization Switzerland 1983
2. pH-Metric Method for the Determination of Acid Numbers of Oils;Lapshina;J. Anal. Chem. of USSR,1991
3. Gas-Liquid Chromatographic Analysis of Fatty Acids and Glycerides in Foods;Ackman;Food Sci. Technol., N.Y.,1992