https://www.zds.si/home/getfile?f=bf5a9edd27fabc3c0007031aa5102075
https://ukandeu.ac.uk/wp-content/uploads/2021/11/Brexit-and-Services-Trade-Working-Paper.pdf
http://www.guengl.eu/uploads/news-documents/Working_paper_Border_controls_on_cross_border_trade_in_goods.pdf
https://www.socialeurope.eu/the-discreet-but-dubious-charm-of-tax-treaties