1. E.W. Fawcett, O.R. Gibson, M.W. Perrin, J.G. Paton, and E.G. Williams, Brit Pat # 571,590 (1937)
2. RO. Symcox and P. Ehrlich, J. Am. Chem. Soc., 84, 531 (1962)
3. J.C. Woodbrey and P. Ehrlich, J. Am. Chem. Soc.,85, 1580 (1963)
4. RO. Gibson, “The Discovery of Polythene”, Roy. Inst. Chem., London Lectures, 1, 1 (1964)
5. E.W. Fawcett, et al., Brit. Pat, # 471,590 (1937)