1. Tribology Data Handbook
2. Noria Corporation(2018).Understanding the differences in base oil groups.https://www.machinerylubrication.com/Articles/Print/29113(accessed 28 August 2018)
3. Lee S. Malevich D. Joshi C. et al. (2018). High performance lubricants produced from renewable base oils. 73rd STLE Annual Meeting and Exhibition 20–24 May Minneapolis MN Program Guide and Schedule p. 122.