https://papers.ssrn.com/sol3/Delivery.cfm/SSRN_ID4092831_code1752653.pdf?abstractid=4092831&mirid=1
https://ecipe.org/wp-content/uploads/2022/04/ECI_22_OccPaper_DMA-DSA-AI_03_2022_LY03.pdf
http://openeurope.org.uk/today/blog/will-brexit-ground-flights-europe/
https://www.bloomberg.com/view/articles/2017-05-31/eu-tax-competition-is-unfair-and-inefficient?utm_source=yahoo&utm_medium=bd&utm_campaign=headline&cmpId=yhoo.headline&yptr=yahoo