A. V.  Raghu, Gadaginamath, G. S., Mathew, N. T., Halligudi, S. B., and Aminabhavi, T. M., ?Synthesis and characterization of novel polyurethanes based on 4,4 `-[1,4-phenylenedi-diazene-2,1-dlyl] bis(2-carboxyphenol) and 4,4 `-[1,4-phenylenedi-diazene-2,1-diyl] bis(2-chlorophenol) hard segments?, Reactive & Functional Polymers, vol. 67, no. 6, pp. 503-514, 2007.

C. G.  Nardele, Dhavale, V. M., Sreekumar, K., and Asha, S. K., ?Ionic conductivity probed in main chain liquid crystalline azobenzene polyesters?, Journal of Polymer Science Part A-Polymer Chemistry, vol. 53, no. 5, pp. 629-641, 2015.