1. Used lubricating oil recycling using hydrocarbon solvents;Ahmad;Journal of Environmental Management,2005
2. Alistair G., 1996. Infrared Analysis as a Tool for Assessing Degradation in Used Engine Lubricants. Wearcheck Africa WZA-002.
3. ASTM International, E-2412-0, 2005. Standard Practice for Condition Monitoring of Used Lubricants by Trend Analysis Using Fourier Transform Infrared (FT-IR) Spectrometry. Standard Volume: 03.06.
4. Strategies for vehicle waste-oil management: a case study;El-Fadel;Resources, Conservation and Recycling,2001
5. Foo C.Y., Rosli M.Y., Tea S.S., 2002. Modeling and simulation of used lubricant oil re-refining process. Second World Engineering Congress Sarawak, Malaysia.