Shradha Kamble, Damini Ausarmal, Shradha kasabe, Preeti Adak, and Prof. Shilpi Arora. “SURVEY ON GEO-GRAPHICAL CHECK-IN ON SPATIO TEMPORAL INFORMATION”. International Journal of Advance Engineering and Research Development (IJAERD), vol. 5, no. 4, Apr. 2018, pp. 2049-53, https://ijaerd.org/index.php/IJAERD/article/view/5082.