https://cdn.occrp.org/projects/suisse-secrets-interactive/en/
https://www.bertelsmann-stiftung.de/fileadmin/files/BSt/Publikationen/GrauePublikationen/WKIO_2020_final.pdf?utm_source=POLITICO.EU&utm_campaign=15a7cc1e87-EMAIL_CAMPAIGN_2020_04_08_08_59&utm_medium=email&utm_term=0_10959edeb5-15a7cc1e87-190380769
https://publications.parliament.uk/pa/cm201719/cmselect/cmworpen/769/769.pdf
https://www.sipri.org/media/press-release/2018/global-arms-industry-us-companies-dominate-top-100-russian-arms-industry-moves-second-place