
https://www.economiesuisse.ch/de/artikel/freihandelsabkommen-efta-indien-eine-grosse-chance-fuer-die-tech-industrie

https://www.brookings.edu/articles/what-are-tariffs-and-why-are-they-rising/

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