B, S., S. S, S.B.Unhale., and S. Yawale. “Application of Nanosize Polycrystalline SnO$_{2}$-WO$_{3}$ Solid Material As CO$_{2}$ Gas Sensor”. Revista Mexicana De Física, vol. 58, no. 6, Jan. 2012, pp. 445-50, https://rmf.smf.mx/ojs/index.php/rmf/article/view/3947.