Hamid Danlami, A., S.-D. Applanaidu, and R. Islam. “Axiom of the relative income hypothesis and household energy choice and consumption in developing areas: Empirical evidence using Verme model”. Kasetsart Journal of Social Sciences, vol. 39, no. 3, July 2018, pp. 422-31, https://so04.tci-thaijo.org/index.php/kjss/article/view/242558.