Hekmatnia, H. ., M. N. . Mousavi, K. Jafarpour Ghalehteimouri, A. Shamsoddini, A. B. . Kashkouli, and A. . Jamshidi. “Population Aging Tendencies in Islamic Countries Between 1950-2020: A Geographical Assessment”. Journal of Population and Social Studies [JPSS], vol. 30, Sept. 2021, pp. 36-53, https://so03.tci-thaijo.org/index.php/jpss/article/view/244074.