KALLEM RAJENDER REDDY; Y.SUNITHA. A Novel Framework to Measure the Degree of Difficulty on Keyword Query Routing. International Journal of Computer Engineering in Research Trends, [S. l.], v. 2, n. 9, p. 640–645, 2015. Disponível em: https://www.ijcert.org/index.php/ijcert/article/view/228. Acesso em: 12 aug. 2026.