Esmond Walshe Barry McMullin Accessing Web Based Documents through a Tree Structural Interface. 560-563 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3118&spage=560 2004 conf/icchp/2004 ICCHP db/conf/icchp/icchp2004.html#WalsheM04