Shixia Liu Yue Pan Liping Yang Wenyin Liu An LOD Model for Graph Visualization and Its Application in Web Navigation. 441-452 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3399&spage=441 2005 conf/apweb/2005 APWeb db/conf/apweb/apweb2005.html#LiuPYL05