“Photo catalytic degradation of Indigo carmine in aqueous media using Nano crystalline zirconia by solid state method: synthesis and characterization”, Euro.J.Ph.Ch.Ma., vol. 12, pp. 55–64, Nov. 2022, Accessed: Jan. 20, 2026. [Online]. Available: https://geniusjournals.org/index.php/ejpcm/article/view/2627