1. McLaren, K. G., Ph.D. Diss., Cambridge (March 1962).
2. Pascoe, M. W., and Tabor, D., Proc. Roy. Soc., A, 235, 210 (1956).
3. King, R. F., and Tabor, D., Proc. Phys. Soc., B, 66, 728 (1953).
4. James, D. I., Norman, R. H., and Payne, A. R., The Physical Properties of Polymers, Soc. Chem. Indust. Monog. No. 5, 233 (1959).
5. Wynne-Williams, D. E., and Tabor, D., Wear, 4, 391 (1961).