1. R. C. Gunderson and A. W. Hart (editors), Synthetic Lubricants, Reinhold, New York (1962).
2. Brit. Pat. 1,280,247.
3. U.S. Pat. 3,790,478.
4. E. Eberhardt, Schmierungstechnik,3, No. 4, 101?105 (1972).
5. T. Sakurai, ASLE Trans.,13, No. 4, 250?261 (1970).