Zhao, S., T. Zhao, H. Yang, M. Lyu, and I. King. “STELLAR: Spatial-Temporal Latent Ranking for Successive Point-of-Interest Recommendation”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 30, no. 1, Feb. 2016, doi:10.1609/aaai.v30i1.9986.