1. See, for example, Bowden, F. P., and Tabor, D., “The Friction and Lubrication of Solids” (Clarendon Press, Oxford, 1950).
2. Bacon, R., “Growth and Perfection of Crystals”, edit. by Doremus, Roberts and Turnbull (John Wiley, 1958).
3. Bowden, F. P., Young, J. E., and Rowe, G., Proc. Roy. Soc., A, 212, 439 (1952). Savage, R. H., J. App. Phys., 19, 1 (1948). Carter, R. L., quoted by Hove, J. E., Trans. Met. Soc., Amer. Inst. Met. Eng., 212, 7 (1958).
4. Tsuzuku, T., Proc. Conf. on Carbon, 433 (Pergamon, 1957).