
https://www.openglobalrights.org/federal-democracy-four-pitfalls/

https://theconversation.com/el-auge-de-las-derechas-elecciones-europeas-y-cambio-de-paradigma-227659

https://www.opendemocracy.net/kamil-matuszczyk/migration-crisis-in-2017-challenges-for-eu-solidarity