BA Bolto, R McNeill and DE Weiss (1963). “Electronic Conduction in Polymers. III. Electronic Properties of Polypyrrole”. Australian Journal of Chemistry16: 1090 - 1103. doi:10.1071/CH9631090.
Hideki Shirakawa, Edwin J. Louis, Alan G. MacDiarmid, Chwan K. Chiang and Alan J. Heeger (1977). “Synthesis of electrically conducting organic polymers: halogen derivatives of polyacetylene, (CH)x”. J. Chem. Soc., Chem. Commun.: 578 - 580. doi:10.1039/C39770000578.