1. Lodge, R. M., “Fibres from Synthetic Polymers”, edit. by R. Hill, Chapter 14 (Elsevier, London, 1954).
2. Bunn, C. W., “Fibres from Synthetic Polymers”, edit. by R. Hill, Chapters 9–12 (Elsevier, London, 1954).
3. Cobbs and Burton, J. Pol. Sci., 10, 275 (1953); and private information and results from R. J. Miller.
4. Meibohm and Smith, J. Pol. Sci., 7, 449 (1951). Cobbol, Daubeny, Deutsch, and Markey, Nature, 172, 806 (1953).