3Helton T E, Degnan T F J, Mazzone D N, et al. Lube oil processing-conclusion: Catalytic hydroprocessing a good alternative to solvent processing[J]. Oil & Gas Journal,1998,96(29):58-67.
4Banta Fred, Staffeld Peter O, McGuiness Mary P, et al. Lube oil processing-2: Improved processes produce high-quality lubes[J]. Oil & Gas Journal,1998,96(28):70-74.
5Papke B L, Dahlstorm P L, Kreuz K L. Surface characterization of model lubricant-derived diesel engine piston deposits[J]. Lubrication Engineering,1989,45(9):575-585.