1. Archimedean spiral, http://www.2dcurves.com/spiral/spirala.html
2. Brown, Donald E. 1998. “The Regional Crime Analysis Program (RECAP): A Framework for Mining Data to Catch Criminals.” In Proceedings for the 1998 International Conference on Systems, MAN, and Cybernetics (San Diego, CA, USA, Oct. 11–14). IEEE, Piscataway, N.J., 2848–2853. University of Virginia, June 1998.
3. Carlis, J. (1998). “Interactive Visualization of Serial Periodic Data,” Proceedings of UserInterface Software and Technology.
4. Chen, H., D. Zeng, H. Atabakhsh, W. Wyzga & J. Schroeder (2003). “COPLINK: Managing Law Enforcement Data and Knowledge,” Communications of the ACM, pp 28–34.
5. Environmental Systems Research Institute (ESRI), http://www.esri.com