1. ASTM Standard D1947-83,1983
2. Wright Laboratories Report No. TR-94-2055;Eusepi M.,1994
3. ANSI/AGMA 110.04,1980
4. Friction, Lubrication, and Wear Technology, Blau , P. J. , ed.ASM Handbook, 18 , ASM , Materials Park , OH , p 535 , ( 1992 ).
5. AFAPL Report No. AFAPL-TR-76-27;Ku P.,1976