
https://publications.parliament.uk/pa/bills/cbill/2019-2020/0007/20007.pdf

https://ec.europa.eu/commission/presscorner/api/files/document/print/en/speech_21_4701/SPEECH_21_4701_EN.pdf

http://www.elperiodico.com/es/politica/20171226/que-es-tabarnia-propuesta-secesion-barcelona-tarragona-resto-cataluna-6517873