Uncloaking Terrorist Networks by Valdis E. Krebs, First Monday, volume 7, number 4 (April 2002).
“This paper looks at mapping covert networks using data available from news sources on the World Wide Web. Specifically, we examine the network surrounding the tragic events of September 11th 2001. Through public data we are able to map a portion of the network centered on the 19 dead hijackers. This map gives us some insight into the terrorist organization, yet it is incomplete. Suggestions for further work and research are offered.”