L.  George, Kunhikannan, A. K., Illathvalappil, R., Ottoor, D., Kurungot, S., and R. Devi, N., ?Understanding the electron transfer process in ZnO-naphthol azobenzoic acid composites from photophysical characterisation?, Physical Chemistry Chemical Physics, vol. 18, no. 32, pp. 22179-22187, 2016.