https://www.adb.org/sites/default/files/publication/754716/nonperforming-loans-asia-europe-causes-impacts.pdf
http://countryeconomy.com/ratings
https://www.brookings.edu/research/keep-calm-and-regulate-on/?utm_campaign=Brookings%20Brief&utm_source=hs_email&utm_medium=email&utm_content=88191095