Tiezheng Nie Derong Shen Ge Yu Yue Kou Subject-Oriented Classification Based on Scale Probing in the Deep Web. 224-229 2008 WAIM http://dx.doi.org/10.1109/WAIM.2008.85 conf/waim/2008 db/conf/waim/waim2008.html#NieSYK08