1. GSMWorld. 2006.GSM Hits Two Billion Milestone. http://www.gsmworld.com/news/press_2006/press06_29.shtml.
2. Cardis, E., Richardson, L. and Deltour, I.,The Interphone study: design, epidemiological methods, and description of the study population. Eur J Epidemiol, 22:647–64, 2007.
3. Stewart, W., Darragh, P., Gelletly, W., Heaton, F.A., Hunter, R., Lees, W.R., Mason, M.D. and White, J.C.,Mobile Phones and Health 2004, Documents of the NRPB, 15(5), 2004.
4. Challis, L., Barclay, L., Breakwell, G., Elliot, P., Grant, E., Haggard, P., Hansson Mild, K., Kuster, N., McKinlay, A., Metcalfe, J., Rugg, M. and Sienkiewicz, Z.,Mobile Telecommunications and Health Research Programme Report 2007, Health Protection Agency, London, Sep 2007.
5. World Health Organisation.WHO Research Agenda for Radiofrequency Fields, World Health Organisation, 2006 (http://www.who.int/pehemf/ research/rf_research_agenda_2006.pdf).