1. Y. Tanaka, Rubber Chem. Technol. 64, 325 (1991)
2. G. Wolfman, Hasenhidl, S. Wolf, Kautsch. Gummi Kunstst. 44(2), 118 (1991)
3. A.Y. Coran, Science and Technology of Rubber, Chapter 7 (Academic Press, New York, 1978)
4. K.D.O. Jackson, M.J.R. Loadman, C.H. Jones, G. Ellis, Spectrochim. Acta 46(2A), 217 (1990)
5. G. Ellis, P.J. Hendra, M.J.R. Loadman, Kautsch. Gummi Kunstst. 43(2), 118 (1990)