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3. ASTM International. Standard Test Method for Determining Stability and Compatibility of Heavy Fuel Oils and Crude Oils by Heavy Fuel Oil Stability Analyzer (Optical Detection), ASTM D7112;ASTM International:West Conshohocken, PA, 2005.
4. ASTM International. Standard Test Method for Automated Heithaus Titrimetry, ASTM D6703;ASTM International:West Conshohocken, PA, 2001.
5. ASTM International. Standard Test Method for Determination of Intrinsic Stability of Asphaltene-Containing Residues, Heavy Fuel Oils, and Crude Oils (n-Heptane Phase Separation; Optical Detection), ASTM D7157;ASTM International:West Conshohocken, PA, 2005.