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https://www.diw.de/documents/publikationen/73/diw_01.c.578096.de/18-7-3.pdf

https://www.niesr.ac.uk/sites/default/files/UK%20Economy%20Press%20Release%20-NIER%20No245%20%20August%202018%20-%20EMBARGOED%20until%2000.01%20Wednesday%201st%20August.pdf