1. F. J. CLAUSS, in ?Solid lubricants and self-lubricating solids? (Academic Press, New York, 1972) p. 113.
2. M. S. DONELY, N. T. McDEVITT, T. HAAS, P. T. MURRAY and J. T. GRANT,Thin Solid Films 168 (1989) 335.
3. M. S. DONELY, P. T. MURRAY, S. A. BARBER and T. W. HAAS,Surf. Coating Technol. 36 (1988) 329.
4. S. V. PRASAD and P. K. ROHATGI,J. Met. 39 (1987) 22.
5. S. V. PRASAD and B. D. McCONNELL, in Proceedings of the International Conference on Wear of Materials ? 1991, Orlando, Florida, April 1991, edited by K. C. Ludema (American Society of Mechanical Engineers, New York) p. 169.