https://www.brookings.edu/wp-content/uploads/2018/03/fp_20180316_future_political_warfare.pdf
https://theconversation.com/investidura-o-bloqueo-y-vuelta-a-las-urnas-a-que-se-va-a-enfrentar-espana-210241
https://feps-europe.eu/news/friends-of-western-balkans-open-letter/
https://ec.europa.eu/commission/presscorner/api/files/document/print/en/speech_21_4701/SPEECH_21_4701_EN.pdf