WONGKASEMJIT, S., and A. LAOBUTHEE. “3 Ways to MgAl204 Spinel Powders Used As a Humidity Sensor”. Journal of Metals, Materials and Minerals, vol. 10, no. 2, Aug. 2022, pp. 13-27, https://jmmm.material.chula.ac.th/index.php/jmmm/article/view/1354.