Hong, Cheng-Yih, Chung-Huang Huang, Jian-Fa Li, and Yi-Chi Tsai. 2018. “Environmental Tax Reform, R&D Subsidies and CO2 Emissions: View Double Dividend Hypothesis”. International Journal of Energy Economics and Policy 8 (5):288-93. https://econjournals.com./index.php/ijeep/article/view/6699.