Praveen J, Sangeetha S V, Shilpa N, Samarth Jain, Sangamesh S K. “A Review: Design and Fabrication of Gas Sensor Using Sol-Gel Spin Coating Technique for the Detection of Ethanol ”. International Journal of Advanced Science and Technology, Vol. 29, no. 08, June 2020, pp. 4833 -41, http://sersc.org/journals/index.php/IJAST/article/view/26760.