Kim, J., C. . Castillejos-Petalcorin, D. . Park, and M. A. . Ruiz Estrada. “Population Aging, Economic Growth, and Old-Age Income Support in Asia”. Thailand and The World Economy, vol. 38, no. 3, Nov. 2020, pp. 1-23, https://so05.tci-thaijo.org/index.php/TER/article/view/240609.