R. Young, M. Pollack, and J. Moore. Proceedings of Second International Conference on Artificial Intelligence and Planning Systems, page 189-193. Chicago, IL, (1994)
T. Finin, R. Fritzson, D. McKay, and R. McEntire. Proceedings of the 3rd International Conference on Information and Knowledge Management (CIKM'94), page 456--463. Gaithersburg, MD, USA, ACM Press, (1994)
M. Tsvetovat, and K. Carley. Technical Report CMU-ISRI-05-130. Carnegie Mellon University, School of Computer Science, Institute for Software Research International, (2005)
M. Tsvetovat, J. Diesner, and K. Carley. Technical Report CMU-ISRI-04-135. Carnegie Mellon University, School of Computer Science, Institute for Software Research International, (2005)
J. Farley. Studies in Conflict and Terrorism, 26 (6):
399-411(November 2003)taylorandfrancis.metapress.com/openurl.asp?genre=article&issn=1057-610X&volume=26&issue=6&spage=399.
R. Goolsby. Proceedings of the 8th International Command and Control Research and Technology Symposium, Conference held at National Defence War College Washington DC, Evidence Based Research Vienna VA, (2003)
J. Diesner, and K. Carley. Technical Report, CMU-ISRI-04-100. Carnegie Mellon University, School of Computer Science, Institute for Software Research International, (2004)