Kallem Rajender Reddy and Y.Sunitha (2015) “A Novel Framework to Measure the Degree of Difficulty on Keyword Query Routing”, International Journal of Computer Engineering in Research Trends, 2(9), pp. 640–645. Available at: https://www.ijcert.org/index.php/ijcert/article/view/228 (Accessed: 12 August 2026).