Kallem Rajender Reddy, and Y.Sunitha. “A Novel Framework to Measure the Degree of Difficulty on Keyword Query Routing”. International Journal of Computer Engineering in Research Trends 2, no. 9 (September 30, 2015): 640–645. Accessed October 16, 2026. https://www.ijcert.org/index.php/ijcert/article/view/228.