G.Parthasarathy, Dr. M.Saroja, Dr. M.Venkatachalam, N.Pradheep, and Sounder.J, “Characterization and Antibacterial activity of Undoped ZnO and Copper doped ZnO thin film prepared by Sol–gel Dip Coating Method”, IJAERD, vol. 4, no. 9, pp. 468–472, Sep. 2017.