https://ippedico.github.io/website/ABIP_entrepreneurship_drain.pdf
https://www.bloomberg.com/politics/articles/2017-04-27/merkel-warns-against-u-k-illusions-in-hard-line-brexit-speech?utm_content=brexit&utm_campaign=socialflow-organic&utm_source=twitter&utm_medium=social&cmpid%3D=socialflow-facebook-brexit
https://committees.parliament.uk/oralevidence/2766/pdf/
https://www.hesa.ac.uk/data-and-analysis/publications/finances-2015-16/introduction