Karel Demeyer, Eva Lievens, and Jos Dumortier  (2012): Blocking and Removing Illegal Child Sexual Content: Analysis from a Technical and Legal Perspective

In Policy & Internet, 4:3-4

 This occurred for instance in the United Kingdom when Wikipedia was blocked based on a single image that was put on the Internet Watch Foundation’s blacklist (Horten, 2008).

Horten, Monica. 2008. “UK ISPs Lock Out Wikipedia in Filtering Error.” IPtegrity.com (December 7)

[Online]. http://www.iptegrity.com/index.php/internet-trials/219-uk-isps-lock-out-wikipedia-infiltering-error. Accessed August 16, 2012