1. Cyberguide: A mobile context-aware tour guide;Abowd;Wireless Networks,1997
2. Intelligent hybrid architecture for tourism services;Almeida,2010
3. Heracles: Hierarchical dynamic constraint networks for interactive planning;Ambite,2003
4. MacauMap: Tourism-oriented mobile GIS application. Proceedings of map Asia 2003;Biuk-Aghai,2003
5. Knowledge-based recommender systems;Burke,2000