1. Intelligent hybrid architecture for tourism services;Almeida,2010
2. Item-based collaborative filtering recommendation algorithms;Sarwar;Proceedings of the 10th International Conference on World Wide Web (WWW),2001
3. J. Escribano and A. Camus. La guia de viajes inteligente que aprende de ti y tus amigos, November 2012. www.slideshare.net/betabeers/touristeye.
4. Foursquare, Inc, foursquare.com. Building a recommendation engine, Foursquare style, March 2011.
5. Amazon-com recommendations item-to-item collaborative filtering;Linden;IEEE Int. Computing,2003