TY - GEN AU - Valls Martínez, María del Carmen AU - Santos-Jaén, José Manuel AU - Amin, Fahim-ul AU - Martín Cervantes, Pedro Antonio PY - 2021 SN - 2227-7390 UR - http://hdl.handle.net/10835/13123 AB - Pension systems are one of the fundamental pillars of the welfare state. The ageing of the population caused by longer life expectancy and low birth rates has led to a crisis in the public pension system in developed countries. Changes for the... LA - en PB - MDPI KW - pensions KW - ageing KW - longevity KW - social security KW - bibliometric KW - review TI - Pensions, Ageing and Social Security Research: Literature Review and Global Trends ER -