1. Bush, G. W. (2001). Executive order establishing office of homeland security. Retrieved from http://www.whitehouse.gov/news/releases/2001/10/20011008-2.html
2. Bush, G. W. (2002). Executive order on critical infrastructure protection. Communications of the ACM.
3. Bychkovskiy, V., Megerian, S., Estrin, D., & Potkanjak, M. (2003). A collaborative approach to in-place sensor calibration. In F. Zhao & L. Guibas (Eds.), Proceedings of the 2nd International Conference on Information Processing in Sensor Networks (LNCS 2634, p. 556).
4. Center for Disease Control (CDC). (2002). Protecting the nation’s health in an era of globalization: CDC’s global infectious disease strategy. Retrieved from http://www.cdc.gov/globalidplan/
5. Center for Disease Control (CDC). (2011). About the tracking program. Retrieved from http://ephtracking.cdc.gov/showAbout.action