https://www.ucl.ac.uk/european-institute/analysis/2016-17/poulsen-investment-policy
https://www.brookings.edu/wp-content/uploads/2018/04/workingpaper114-elephantchartrevisited.pdf
https://www.politico.eu/wp-content/uploads/2021/11/02/Coercion.pdf
http://www.ips-journal.eu/regions/europe/article/show/free-spirits-2331/