Council of Europe, Terrorism: Protection of Witnesses and Collaborators of Justice, 2006, p. 52 ([Internet, 2017-08-21](https://books.google.ch/books?id=JCMNEJ-pLcEC&pg=PA52&lpg=PA52&dq=%22protective+measures+for+witnesses%22+non-procedural&source=bl&ots=llLgbXyxaN&sig=WBgEER5gqdWhrnxnb_o5PlfJzy8&hl=de&sa=X&ved=0ahUKEwixhJezp-jVAhVIJsAKHZB5A_YQ6AEIXTAI#v=onepage&q=%22protective%20measures%20for%20witnesses%22%20non-procedural&f=false))