https://www.socialeurope.eu/2017/07/european-welfare-states-perform/
https://theconversation.com/radicalizacion-violenta-similitudes-y-diferencias-en-la-evolucion-del-ira-y-eta-196509
https://wiiw.ac.at/the-long-way-round-lessons-from-eu-cee-for-improving-integration-and-development-in-the-western-balkans-dlp-6194.pdf