https://es.insightcrime.org/noticias/analisis/gamechangers-2018-crimen-ideologia/
https://researchbriefings.files.parliament.uk/documents/CBP-9255/CBP-9255.pdf
http://www.ecfr.eu/page/-/ECFR_215_GERMANY_VOTES_EUROPEAN_DILEMMAS_IN_THE_FEDERAL_ELECTION.pdf