C. Guestrin, D. Koller, C. Gearhart, and N. Kanodia. IJCAI'03: Proc. 18th Int'l Jt. Conf.
on Artificial intelligence, page 1003--1010. Acapulco, Mexico, Morgan Kaufmann Publishers Inc., (2003)
A. Noulas, S. Scellato, N. Lathia, and C. Mascolo. Proceedings of the 2012 IEEE 12th International Conference on Data Mining, page 1038--1043. Washington, DC, USA, IEEE Computer Society, (2012)