Hua Jiang Bing Han Ying Lin Dan Zuo Yong Xing Ge Design and Implementation of University Focused Crawler Based on BP Network Classifier. 44-47 2009 WKDD http://dx.doi.org/10.1109/WKDD.2009.77 conf/wkdd/2009 db/conf/wkdd/wkdd2009.html#JiangHLZG09