
https://www.goldmansachs.com/pdfs/insights/pages/gs-research/the-path-to-2075-slower-global-growth-but-convergence-remains-intact/report.pdf

http://cep.lse.ac.uk/pubs/download/special/cepsp34.pdf

https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef22024en.pdf