1. Morton-Jones, D.H. and Ellis, J.W. (1986) Polymer Products. Chapman and Hall, London, Ch. 21.
2. Morrell, S.H. (1982) in Rubber Technology and Manufacture, 2nd edn (eds Blow, C.M. and Hepburn, C.) Butterworths, London, pp. 171–201.
3. Horn, J.B. (1982) in Rubber Technology and Manufacture, 2nd edn (eds Blow, C.M. and Hepburn, C.) Butterworths, London, pp. 202–63.
4. Morton-Jones, D.H. and Ellis, J.W. (1986) Polymer Products. Chapman and Hall, London.