Lin Li Zhenglu Yang Kulwadee Somboonviwat Masaru Kitsuregawa User-assisted similarity estimation for searching related web pages. 11-20 2007 conf/ht/2007 Hypertext http://doi.acm.org/10.1145/1286240.1286245 db/conf/ht/ht2007.html#LiYSK07