Shubat, Oksana, and Anna Bagirova. “Forecasting the Length of Grandparenthood With Limited Information Resources: Evidence From Russia”. Journal of Population and Social Studies [JPSS] 30 (January 21, 2022): 251–268. Accessed May 2, 2024. https://so03.tci-thaijo.org/index.php/jpss/article/view/257752.