Karki, IB, JJ Nakarmi, PK Mandal, and S Chatterjee. 2013. “Absorption Spectra of Natural Dyes and Their Effect on Efficiency of ZnO Based Dye-Sensitized Solar Cells”. Nepal Journal of Science and Technology 13 (1):179-85. https://doi.org/10.3126/njst.v13i1.7457.