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2. ASTM D1534, 2013. Standard Test Method for Approximate Acidity in Electrical Insulating Liquids by Color-Indicator Titration. Annual Book of Standards, ASTM International, West Conshohocken, PA.
3. ASTM D2896, 2013. Standard Test Method for Base Number of Petroleum Products by Potentiometric Perchloric Acid Titration. Annual Book of Standards, ASTM International, West Conshohocken, PA.
4. ASTM D3339, 2013. Standard Test Method for Acid Number of Petroleum Products by Semi-Micro Color Indicator Titration. Annual Book of Standards, ASTM International, West Conshohocken, PA.
5. ASTM D664, 2013. Standard Test Method for the Acid Number of Petroleum Products by Potentiometric Titration. Annual Book of Standards, ASTM International, West Conshohocken, PA.