
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/643924/Foreign_policy__defence_and_development_paper.pdf

https://www.cesifo-group.de/DocDL/ifoDD_18-01_03-09_Ochsner.pdf

http://cdn.budgetresponsibility.org.uk/July_2017_Fiscal_risks.pdf