https://www.politico.eu/article/eu-us-and-russia-held-secret-talks-days-before-nagorno-karabakh-crisis/
https://theconversation.com/las-leyes-de-lanchester-guerras-y-ecuaciones-222469
http://www.ips-journal.eu/regions/europe/article/show/the-new-east-bloc-is-open-for-business-2523/