https://www.socialeurope.eu/lexit-fallacies
https://www.cesifo-group.de/DocDL/ifoDD_18-01_03-09_Ochsner.pdf
https://www.nao.org.uk/wp-content/uploads/2017/07/The-Customs-Declaration-Service.pdf
https://committees.parliament.uk/oralevidence/2766/pdf/