1. Amos, R. (1967) J. Chromatog. 31, 263.
2. Edwards, A.D., McSweeney, G.P., Roberts, A.D. and Tidd, B.K. (1976) Unpublished work at MRPRA.
3. Galloway, P.D. and Foxton, R.N. (1950) J. Rubber. Res. 19, 74.
4. Gleeson, J.G. and Loadman, M.J.R (1996) Paper presented to the Polym. Chem. Div. Am. Chem. Soc. Meeting, Florida.
5. Kirchhof, F. (1925) Gummi Ztg. 39, 849; (1955) Chem. Ztg. 79, 434.