
http://www.europarl.europa.eu/sides/getDoc.do?pubRef=-%2f%2fEP%2f%2fNONSGML%2bCOMPARL%2bPE-627.625%2b01%2bDOC%2bPDF%2bV0%2f%2fEN

https://rm.coe.int/seventeenth-general-activity-report-2016-of-the-group-of-states-agains/168071c885

https://ecfsapi.fcc.gov/file/109303096909269/Sage%20&%20Carpenter,%202009.pdf