1. Börsch-Supan, A. H., & Wilke, C. W. (2005). Reforming the German public pension system.
http://www.rand.org/labor/aging/rsi/rsi_papers/2006_axel1.pdf
2. Capretta, J. C. (2007). Global aging and the sustainability of public pension systems: An assessment of reform efforts in twelve developed countries. A report of the aging vulnerability index project. Washington, DC: Center for Strategic & International Studies.
http://csis.org/files/media/csis/pubs/pension_profile.pdf
3. Chen, T., & Turner, J. A. (2015). Longevity insurance annuities: China adopts a benefit innovation from the past. International Social Security Review, 68(2), 27–41.
4. Expert Committee on the Future of the Québec Retirement System. (2013). Innovating for a sustainable retirement system: A social contract to strengthen the retirement security of all Québec workers.
http://www.rrq.gouv.qc.ca/SiteCollectionDocuments/www.rrq.gouv.qc/Anglais/publications/rapport_comite/rapport.pdf
5. Ezra, D. (2016). Most people need longevity insurance rather than an immediate annuity. Financial Analysts Journal, 72(2), 23–29.
http://www.cfapubs.org/doi/pdf/10.2469/faj.v72.n2.3
.