Managing graffiti / Perpetuity Group, May 2007
http://www.perpetuitygroup.com/prci/news.html#graffiti
"Currently graffiti and 'etching' are a major financial cost to local authorities, councils, retailers and transport operators. In addition they reduce the quality of the environment and frequently put the offenders at risk of their own lives. Understanding the factors which contribute to and can prevent graffiti is a critical step for building an effective response to manage it."