“ Studying the Structural, Optical and Electrical Properties of ZnO: SnO2 Thin Films As an Application of a Gas Sensor Using Vacuum Thermal Evaporation Technique”. Tikrit Journal of Pure Science, vol. 28, no. 6, Dec. 2023, pp. 66-75, https://doi.org/10.25130/tjps.v28i6.1379.