https://ec.europa.eu/commission/sites/beta-political/files/customs_controls_0.pdf
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/502291/54284_EU_Series_No1_Web_Accessible.pdf
https://www.cfr.org/blog/power-and-financial-interdependence
https://www.ui.se/globalassets/ui.se-eng/publications/other-publications/the-limits-of-economic-coercion.pdf?utm_source=POLITICO.EU&utm_campaign=d3cc0cf4ef-EMAIL_CAMPAIGN_2021_12_02_09_59&utm_medium=email&utm_term=0_10959edeb5-d3cc0cf4ef-190380769