D. Anil Kumar , G. Surya Narayana , Dr. M. Rudra Kumar. 2017. “Predicting User Geographical Service Rating in Social Network Using Point of Interest Recommendation”. International Journal of Emerging Trends in Science and Technology 4 (09), 5898-5904. https://igmpublication.org/ijetst.in/index.php/ijetst/article/view/1390.