https://ecipe.org/blog/second-hamiltonian-moment/?mc_cid=cdc41ebfc8&mc_eid=286ad5ef5f
https://www.esri.ie/system/files/publications/QEC2019SPR_SA_Bergin.pdf
https://blogs.lse.ac.uk/europpblog/2021/10/22/unexpected-lessons-from-spains-economic-rise/
http://www.ips-journal.eu/topics/european-union/article/show/eu-assurance-co-2037/