1. Spiekermann, S., Grossklags, J., Berendt, B.: E-privacy in 2nd generation e-commerce: privacy preferences versus actual behavior. In: EC. ACM, New York (2001)
2. Gruteser, M., Grunwald, D.: Anonymous usage of location-based services through spatial and temporal cloaking. In: MobiSys. ACM, New York (2003)
3. Kido, H., Yanagisawa, Y., Satoh, T.: Protection of location privacy using dummies for location-based services. In: ICDEW. IEEE, Los Alamitos (2005)
4. Gedik, B., Liu, L.: A customizable k-anonymity model for protecting location privacy. Technical report, Georgia Institute of Technology (2004)
5. Mokbel, M.F., Chow, C.Y., Aref, W.G.: The new casper: query processing for location services without compromising privacy. In: VLDB (2006)