1. Abowd, G.D., Atkeson, C.G., Hong, J., Long, S., Kooper, R., Pinkerton, M.: Cyberguide: a mobile context-aware tour guide. Wirel. Netw. (1997)
2. Apple, http://www.apple.com/macosx/features/spotlight/
3. Baeza-Yates, R., Dupret, G., Velasco, H.: A study of mobile search queries in japan. In: WWW 2006 (2006)
4. Beagle, http://beagle-project.org/main_page
5. Chen, J., Diekema, A., Taffet, M.D., McCracken, N.J., Ozgencil, N.E., Yilmazel, O., Liddy, E.D.: Question answering: CNLP at the TREC-10 question answering track. In: Text REtrieval Conference (2001)