Hironori Hiraishi Hisayoshi Kato Naonori Ohtsuka Fumio Mizoguchi Web Site Rating and Improvement Based on Hyperlink Structure. 429-434 2001 conf/dis/2001 Discovery Science http://dx.doi.org/10.1007/3-540-45650-3_36 db/conf/dis/dis2001.html#HiraishiKOM01