Tetsuhiro Miyahara Takayoshi Shoudai Tomoyuki Uchida Kenichi Takahashi Hiroaki Ueda Discovery of Frequent Tree Structured Patterns in Semistructured Web Documents. 47-52 2001 conf/pakdd/2001 PAKDD http://link.springer.de/link/service/series/0558/bibs/2035/20350047.htm db/conf/pakdd/pakdd2001.html#MiyaharaSUTU01