G. Narsinga Rao, N. R. S. V. R. “Effect of Annealing Temperature on Optical & Dielectric Properties of Zn Doped Hematite Nanoparticles”. International Journal of Advanced Science and Technology, Vol. 29, no. 3s, Mar. 2020, pp. 153 -63, http://sersc.org/journals/index.php/IJAST/article/view/5554.