https://wiiw.ac.at/new-study-eu-tobacco-tax-reform-could-boost-revenues-and-cut-smoking-n-725.html
http://www.bankofengland.co.uk/publications/Documents/speeches/2017/speech1001.pdf
http://www.sgi-network.org/2017/About
https://www.bundesverfassungsgericht.de/SharedDocs/Pressemitteilungen/DE/2020/bvg20-032.html