http://www.debtwire.com/pdf/EuropeanNPLFY18!.pdf
https://www.bruegel.org/sites/default/files/wp_attachments/China-WP-02-050422-final.pdf
https://www.sciencedirect.com/science/article/pii/S2542435121000830/pdfft?md5=cdf440c00dde4a8e080cc3901da4c60b&pid=1-s2.0-S2542435121000830-main.pdf
https://insightcrime.org/news/telegram-drug-dealing-marketplace-argentina/