http://www.css.ethz.ch/content/dam/ethz/special-interest/gess/cis/center-for-securities-studies/pdfs/CSSAnalyse225-EN.pdf
https://ukandeu.ac.uk/study-of-federalism-uk-eu-relationship/?mc_cid=ef569320c7&mc_eid=815b1928ec
https://www.ips-journal.eu/topics/foreign-and-security-policy/how-the-eu-can-secure-its-position-in-central-asia-6502/