https://www.eurofound.europa.eu/sites/default/files/ef_publication/field_ef_document/ef20023en.pdf
http://www.theglobalipcenter.com/wp-content/uploads/2018/02/GIPC_IP_Index_2018.pdf
https://www.ippr.org/files/2017-09/cej-interim-report-summary-170911.pdf
https://www.occrp.org/en/loosetobacco/blowing-unsmoke/unsmoking-for-health