1. McCurley, K.S.: Geospatial mapping and navigation of the web. In: Proceedings of the WWW 2001, pp. 221–229. ACM, Hong Kong (2001)
2. Buyukkokten, O., Cho, J., Garcia-Molina, H., Gravano, L., Shivakumar, N.: Exploiting geographic location information of web pages. In: ACM SIGMOD, Workshop on the Web and Databases. ACM, Philadelphia (1999)
3. Ding, J., Gravano, L., Shivakumar, N.: Computing geographic scopes of web resource. In: The International Conference on VLDB, pp. 545–556. Morgan Kaufman, Cairo (2000)
4. Silva, M.J., Martins, B., Chaves, M.S., Afonso, A.P., Cardoso, N.: Adding geographic scopes to web resources. Computers, Environment and Urban Systems 30(4), 378–399 (2006)
5. Lecture Notes in Computer Science;B. Martins,2005