Rajput, S., F. Qureshi, and T. . Aziz. “Demographic Changes and Direct Tax Dynamics in OECD and Non-OECD Markets: A Revisit”. Asian Journal of Applied Economics, vol. 28, no. 1, Dec. 2020, pp. 1-17, https://so01.tci-thaijo.org/index.php/AEJ/article/view/243149.