Vishnupriya, B.A., N. Senthamarai, and S. Bharathi. “Efficient NN Spatial Keyword Search Using Spatial Inverted (SI) Index”. International Journal of Engineering and Technology 7, no. 2.19 (April 17, 2018): 17–20. Accessed April 9, 2025. https://sciencepubco.com/index.php/IJET/article/view/12101.