https://wiiw.ac.at/regulatory-convergence-within-technical-barriers-to-trade-dlp-6630.pdf
https://www.cecimo.eu/wp-content/uploads/2022/01/OP0122_Paper.pdf
https://www.politico.eu/article/paul-magnette-belgium-wallonia-returns-to-spoil-europe-free-trade-agenda/?utm_source=newsletter&utm_medium=email&utm_campaign=26%2F09%2F22
https://ecipe.org/blog/trade-relationship-status-open/?mc_cid=88a1251206&mc_eid=286ad5ef5f