http://www.reineu2016.eu/system/reineu2016/files/REinEU2016.pdf?1477674044
https://rusi.org/sites/default/files/by_parity_and_presence_final_web_version.pdf
http://sro.sussex.ac.uk/id/eprint/110932/1/BP-70.pdf
https://www.gcsp.ch/sites/default/files/2026-03/PB_25_Trump_Adm_NSS%3Bdigital.pdf