1. F. P. Bowden andD. Tabor, ?The Friction and Lubrication of Solids? (Oxford University Press, Cambridge, 1954).
2. Idem, ?Friction and Lubrication? (Wiley, New York, 1956).
3. D. Tabor, ?The Hardness of Metals? (Clarendon Press, Oxford, 1951).
4. M. E. Sikorski,Wear 7 (1964) 144.
5. J. P. Giltrow,ibid 15 (1970) 71.