Zhu Zhang Dragomir R. Radev Combining Labeled and Unlabeled Data for Learning Cross-Document Structural Relationships. 32-41 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3248&spage=32 2004 conf/ijcnlp/2004 IJCNLP db/conf/ijcnlp/ijcnlp2004.html#ZhangR04