Claudine Santos Badue Ricardo A. Baeza-Yates Berthier A. Ribeiro-Neto Artur Ziviani Nivio Ziviani Analyzing imbalance among homogeneous index servers in a web search system. 592-608 2007 43 Inf. Process. Manage. 3 http://dx.doi.org/10.1016/j.ipm.2006.09.002 db/journals/ipm/ipm43.html#BadueBRZZ07