1. Adam, S., Henry, A. K., & Jeffrey, P. B. (2012). Finding your friends and following them to where you are. In Proceedings of the Fifth ACM International Conference on Web Search and Data Mining (pp. 723-732). ACM.
2. Alves, A. O., Rodrigues, F., & Pereira, F. C. (2011). Tagging space from information extraction and popularity of points of interest. In Proceedings of the 2nd International Conference on Ambient Intelligence (pp. 115-125). IEEE.
3. Anastasios, N., Salvatore, S., Cecilia, M., & Massimiliano, P. (2011). An empirical study of geographic user activity patterns in foursquare. In Proceedings of the 5th International AAAI Conference on Weblogs and Social Media (pp. 570-573). AAAI.
4. A data-oriented survey of context models
5. Eunjoon, C., Seth, A. M., & Jure, L. (2011). Friendship and mobility: user movement in location-based social networks. In Proceedings of the 17th ACM SIGKDD International Conference on Knowledge Discovery and Data mining (pp. 1082-1090). ACM.