Hassan Taj, Ehtsham ul Haq Raja, Bushra Kanwal, Muhammad Sajid, and Aamir Sohail, “The Role of Environmental Taxation in Mitigating CO₂ Emissions: Testing the Environmental Kuznets Curve Hypothesis is South Asian Economies”, IJEMD-SS, vol. 5, no. 5, pp. 590–620, Oct. 2026.