1. Lubricant additive chemistry;Gergel,1984
2. Industrial Maintenance Reference Guide;Rosaler,1987
3. ASTM D 2783-88, Measurement of Extreme Pressure Properties of Lubricating Fluids (Four-Ball Method), 408–415.
4. ASTM D 4172-88, Wear Preventive Characteristics of Lubricating Fluid (Four-Ball Method), 267–270.