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Foreign Direct Investment, Trade Openness and Environmental Degradation in SSA Countries. A Quadratic Modeling and Turning Point Approach. Am. J. Environ. Econ. [Internet]. 2023 May 9 [cited 2026 Jun. 13];2(1):9-18. Available from: https://www.e-pallipublishers.com/index.php/ajee/article/view/1414