1. Rabolt JF, Clarke TC, Kanazawa KK, Reynolds JR, Street GB (1980) J Chem Soc Chem Commun 347; Chance RR, Shacklette LW, Miller GG, Ivori DM, Sowa JM, Elsenbaumer RL, Baughman RH (1980) J Chem Soc Chem Commun. 348; Brédas JL, Silbey R (eds) (1991) in: Conjugated polymers: the novel science and technology of highly conducting and nonlinear optically active materials; Kluwer, Dordrecht, the Netherlands
2. Brédas JL, Street GB (1985) Acc Chem Res 18:309
3. Furukawa Y, Ohtsuka H, Tasumi M (1993) Synth Met 55?57:516
4. Ramsey MG, Steinmüller D, Netzer FP (1990) Phys Rev B42:5902
5. Meerholz K, Heinze J (1990) Angew Chem Int Ed Engl 29:692