https://www.socialeurope.eu/greek-economy-recovering-exiting-crisis
http://www.oecd-ilibrary.org/docserver/download/5jlv2jhfnt48-en.pdf?expires=1494939516&id=id&accname=guest&checksum=08592067325A17BFB82AC6F6E15110B2
http://www.resolutionfoundation.org/app/uploads/2017/01/Audit-2017.pdf
https://www.diw.de/documents/publikationen/73/diw_01.c.578096.de/18-7-3.pdf