Biswajit Chowdhury, Sitangshu Shekhar Pradhan, Hari Sankar Das, and Bhaskar Biswas, “Visible Light Induced Photocatalytic Dye Degradation by Cobalt Oxide Nanoparticles”, Fine Chemical Engineering, vol. 1, no. 2, pp. 104–117, Sep. 2020.