https://trade.ec.europa.eu/doclib/docs/2018/april/tradoc_156791.pdf
https://www.bruegel.org/sites/default/files/2022-10/PC%2018%202022_1.pdf
https://www.economiesuisse.ch/de/artikel/faktencheck-bilaterale-iii
https://institute.global/news/customs-and-exiting-european-union