R.Sivasankari , Dr.K.Thamizharasan *, Dr.P.Anuradha. “Characterization of Nanocrystalline Nickel Doped Titanium -Dioxide, Synthesized by Co Precipitation Method.”. International Journal of Emerging Trends in Science and Technology, Vol. 4, no. 09, Sept. 2017, pp. 6103-9, http://igmpublication.org/ijetst.in/index.php/ijetst/article/view/1424.