1. International Telecommunications Union, World telecommunication/ICT indicators database, Technical Report, 2008.
2. J. Burke, D. Estrin, M. Hansen, A. Parker, N. Ramanathan, S. Reddy, M.B. Srivastava, Participatory sensing, in: WSW’06 at SenSys’06, 2006.
3. M. Mun, S. Reddy, K. Shilton, N. Yau, J. Burke, D. Estrin, M. Hansen, E. Howard, R. West, P. Boda, PEIR, the personal environmental impact report, as a platform for participatory sensing systems research, in: Mobisys’09: Proceedings of the 7th International Conference on Mobile Systems, Applications, and Services, 2009.
4. Scalable, distributed, real-time map generation;Davies;IEEE Pervasive Computing,2006
5. K. Mansley, A.R. Beresford, D. Scott, The carrot approach: encouraging use of location systems, in: UbiComp’04: Proceedings of the Sixth International Conference on Ubiquitous Computing, 2009.