1. F.P. Bowden and D. Tabor, The Friction and Lubrication of Solids. Oxford University Press, Part I (1950), Part II (1964).
2. J.F. Archard, Wear 2 (1958/59). 438.
3. See for example Chapter 6 in Friction and Wear of Materials, E. Rabinowicz: John Wiley, New York (1965).
4. J. Woolman and R.A. Mottram. The Mechanical and Physical Properties of the British Standard Ea Steels (B.S. 970–1955), Pergamon Press, (1969), 3, 482.
5. P.D. Goode, Nucl. Instr. and Methods 92 (1971), 447.