1. S. Hotta, in Handbook of Organic Conductive Molecules and Polymers, edited by H. S. Nalwa (John Wiley & Sons, Inc., New York, USA, 1997), p. 309.
2. R. Menon, in Handbook of Organic Conductive Molecules and Polymers, edited by H. S. Nalwa (John Wiley & Sons, Inc., New York, USA, 1997), p. 47.
3. J.L. Bredas, K. Cornil, F. Meyers, and D. Beljonne, in Handbook of Conducting Polymers, edited by T. A. Skotheim, R. L. Elsenbaumer, and J. R. Reynolds (Marcel Dekker, Inc., New York, 1998), p. 1.