Joshi, Leela Pradhan, et al. “Preparation and Characterization of Zinc Oxide Based Photoanode for Dye-Sensitized Solar Cell Using Delonix Regia Natural Dye Extract”. Journal of Nepal Physical Society, vol. 4, no. 1, May 2017, pp. 1-6, doi:10.3126/jnphyssoc.v4i1.17329.