K. Prasad Babu, K. S.K.Rao Patnaik, and R. Shyam sunder, “Recovery of Copper by Using Flotation Techniques and Microbe- Mineral Surface Interaction”, IJET, vol. 7, no. 3.29, pp. 732–736, Nov. 2018, doi: 10.14419/ijet.v7i4.29.21648.