1. C.K. Chiang, C.R. Fincher, Jr., Y.W. Park, A.J. Heeger, H. Shirakawa, E.J. Louis, S.C Gau, A.G. MacDiarmid: Phys. Rev. Lett. 39, 1098 (1977)
2. for recent reviews see e.g. J.CW. Chien: Polyacetylene, Chemistry, Physics, and Material Science (Academic Press, Orlando, 1984)
3. S. Roth: Charge Transport in Conducting Polymers in Festkörperprobleme (Advances in Solid State Physics), Volume XXIV, 119, P. Grosse (Ed.) Vieweg, Braunschweig 1984
4. Y.W. Park, A.J. Heeger, M.A. Druy, A.G. MacDiarmid: J. Chem. Phys. 73, 946 (1980)
5. Y. Tomkiewicz, T.D. Schultz, H.B. Brom, A.R. Taranko, T.C Clarke, G.B. Street: Phys. Rev. B24, 4348 (1981)