Z. El Maliki, M. Bouachrine, M. Hamidi, L. Bejjit, and M. Haddad, “Theoretical Studies on the Structural, Electronic and Optical Properties of the New π-conjugated Copolymers Based on Carbazole and Thiophene”, J. Sci. Res., vol. 4, no. 1, p. 119, Dec. 2011.