https://ep00.epimg.net/descargables/2018/05/24/bfe9a6898e6b41480fd9d57aff93bc10.pdf
https://ec.europa.eu/commission/sites/beta-political/files/revised_withdrawal_agreement_including_protocol_on_ireland_and_nothern_ireland.pdf
http://www.elperiodico.com/es/politica/20171226/que-es-tabarnia-propuesta-secesion-barcelona-tarragona-resto-cataluna-6517873
https://socialeurope.eu/a-european-solidarity-pact