V, T., K. Kumarasamy, T. Devendhiran, M. K, and I. L. “Structural and Optical Properties of Tungsten Doped TiO2 Thin Films Fabricated by Spray Pyrolysis Technique”. Bulletin of Scientific Research, vol. 2, no. 1, Jan. 2020, pp. 1-8, doi:10.34256/bsr2011.