https://www.martenscentre.eu/wp-content/uploads/2022/04/Spring-2022-European-View.pdf
https://www.realclearworld.com/articles/2023/03/08/as_nato_grows_so_do_its_problems_886163.html?utm_source=newsletter&utm_medium=email&utm_campaign=09%2F03%2F2023%20%20
https://www.gmfus.org/sites/default/files/2022-02/Keil%20-%20NATO%20core%20tasks%20-%20brief%20NEW.pdf
https://apps.dtic.mil/sti/pdfs/AD1151522.pdf