http://www.epc.eu/documents/uploads/pub_7655_riseofpostnationaldemocracy.pdf
https://theconversation.com/investidura-o-bloqueo-y-vuelta-a-las-urnas-a-que-se-va-a-enfrentar-espana-210241
https://theconversation.com/snap-elections-in-france-a-political-scientist-lays-out-whats-at-stake-232036