1. Ahas, R., Aasa, A., Roose, A., Mark, Ü. & Silm, S. (2007a). Mobile positioning as a new data source and method for tourism surveys: an Estonian Case Study. Tourism Management (Published online June 2007) http://www.sciencedirect.com/science/journal/02615177. [Please refer to the PAPER publication]
2. Ahas, R., Aasa, A., Mark, Ü., Pae, T. & Kull, A. (2007b). Seasonal tourism spaces in Estonia: case study with mobile positioning data. Tourism Management 28(3): 898–910.
3. Ahas, R., Aasa, A., Silm, S. & Tiru, M. (2007c). Mobile positioning data in tourism studies and monitoring: case study in Tartu, Estonia. In M. Sigala, L. Mich and J. Murphy (Eds.), Springer Computer Science: Information and Communication Technologies in Tourism (pp. 119–128). Wien/New York, Springer.
4. Ahas, R. & Saluveer E. (2007). Concept of Smart Street: observing street life with passive mobile positioning data. IGU Commission on the Geography of Information Society, Digital Communities 2007. Tallinn, Estonia ∼ Helsinki, Finland, July 8–12, 2007. [Editor, publisher, place, pages?]
5. Ahas, R. & Mark, Ü. (2005). Location based services —new challenges for planning and public administration? Futures 37(6): 547–561.