
http://www.guengl.eu/uploads/news-documents/Working_paper_Border_controls_on_cross_border_trade_in_goods.pdf

https://www.ilriformista.it/come-litalia-ha-drogato-leconomia-dagli-anni-70-cosi-la-crescita-rimane-un-miraggio-415786/

https://www.brookings.edu/articles/as-local-governments-finalize-their-american-rescue-plan-priorities-some-dollars-have-become-easier-to-spend/