http://www.oecd.org/std/Hows-Life-2017-60-second-guide.pdf
https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef1733en.pdf
https://www.transparency.de/fileadmin/Redaktion/Publikationen/2019/19-09-01_TI-D_Gutachten_Momsen.pdf
https://www.science.org/content/article/cutting-cartel-recruitment-could-be-only-way-reduce-mexico-s-violence