1. Cyberguide: A mobile context-aware tour guide;Abowd;Wireless Networks,1997
2. Towards a better understanding of context and context-awareness;Abowd,1999
3. Discovering bits of place histories from people's activity traces;Andrienko,2010
4. Location-based and preference-aware recommendation using sparse geo-social networking data;Bao,2012
5. Where would you go this weekend?;Bart,2013