https://pure.royalholloway.ac.uk/portal/files/26649214/arkolakis_doxiadis_galenianos_greek_trade_adjustment_september_2014.pdf
https://www.instituteforgovernment.org.uk/sites/default/files/publications/IfG_Brexit_customs_WEB.pdf
https://www.gov.uk/government/speeches/eu-speech-at-bloomberg