1. J.P. Pouget, Z. Oblakowski, Y. Nogami, P.A. Albouy, M. Laridjani, E.J. Oh, Y. Min, A.G. Mac Diarmid, J. Tsukamoto, T. Ishiguro, A.j. Epstein in ref. [1] p.131.
2. A.J. Epstein J. Joo, R.S. Kohlman, G.Du, A.G. Mac Diarmid, E.J. Oh, Y. Min, J. Tsukamoto, H. Kaneko, J.P. Pouget in ref. [1] p. 149.
3. Y.Z. Wang, J. Joo, C.-H. Hsu, J.P. Pouget, A.J. Epstein, to be published.
4. Y.Z. Wang, J. Joo, C.-H. Hsu and A.J. Epstein, Synth. Met. (submitted)