Salazar-Núñez, Héctor F., et al. “Impact of Energy Consumption and Carbon Dioxide Emissions on Economic Growth: Cointegrated Panel Data in 79 Countries Grouped by Income Level”. International Journal of Energy Economics and Policy, vol. 10, no. 2, Jan. 2020, pp. 218-26, https://econjournals.com./index.php/ijeep/article/view/8783.