http://www.diw.de/documents/publikationen/73/diw_01.c.562050.de/17-29.pdf
https://carnegieeurope.eu/strategiceurope/90555
UKIN-State-of-the-EU-Report-1.pdf (ukandeu.ac.uk)
http://www.eba.europa.eu/documents/10180/2101654/Letter+to+MEPs+on+the+request+to+investigate+a+possible+BUL+under+Article+17+of+Regulation+%28EU%29%20No+10932010+-+24092018.pdf