1. Kinkade, S., Verclas, K.: Wireless technology for social change: Trends in mobile use by NGOs. UN Foundation–Vodafone Group Foundation Partnership, United Kingdom (2008) (retrieved November 15, 2008)
2. World Health Organization (WHO): WHO Air Quality Guidelines for Particulate Matter, Ozone, Nitrogen Dioxide and Sulfur Dioxide: Global Update 2005 (2006)
3. Panofsky, W.: Nuclear proliferation risks, new and old. Issues in Science and Technology 19(4), 73–74 (2003)
4. IAEA: Trafficking in Nuclear and Radioactive Material in 2005 (2006),
http://www.iaea.org/NewsCenter/News/2006/traffickingstats2005.html
5. Campbell, A., Eisenman, S., Lane, N., Miluzzo, E., Peterson, R.: People-centric urban sensing. In: Proceedings of the 2nd Annual International Workshop on Wireless Internet, p. 18. ACM, New York (2006)