“On the Heterogeneity in Longevity Among Socioeconomic Groups: Scope, Trends, and Implications for Earnings-Related Pension Schemes”. Global Journal of Human-Social Science 17, no. E1 (April 6, 2017): 31–57. Accessed September 21, 2026. https://socialscienceresearch.org/index.php/GJHSS/article/view/1961.