https://www.osw.waw.pl/sites/default/files/pw_69_pesco_ang_net.pdf
https://www.aspistrategist.org.au/from-the-bookshelf-deterring-armageddon-a-biography-of-nato/
https://www.geostrategy.org.uk/britains-world/unseen-but-vital-britain-and-undersea-security/?utm_source=newsletter&utm_medium=email&utm_campaign=09%2F03%2F2023
http://www.css.ethz.ch/content/dam/ethz/special-interest/gess/cis/center-for-securities-studies/pdfs/ST2018.pdf