1. American Petroleum Institute (API), API 1509 2016, Appendix Ewww.api.org
2. Synthetics, Mineral Oils, and Bio-Based Lubricants;Rudnick,2014
3. Synthetic Lubricants Market Size to Exceed USD 5 Billion by 2023www.gminsights.com
4. Esters—The most versatile of base stock technologies;Eastwood;Lube Mag.,2015
5. Development of ecofriendly/biodegradable lubricants: An overview