Hong, C.-Y., C.-H. Huang, J.-F. Li, and Y.-C. Tsai. “Environmental Tax Reform, R&D Subsidies and CO2 Emissions: View Double Dividend Hypothesis”. International Journal of Energy Economics and Policy, vol. 8, no. 5, Sept. 2018, pp. 288-93, https://www.econjournals.com/index.php/ijeep/article/view/6699.