I came across an interesting article in D-Lib that summarizes some of the work at Xerox PARC, Research in Support of Digital Libraries at Xerox PARC Part II: Technology. This is, as the title suggests, is the second part of an extended survey. The article covers some projects on subjects like “visualization of large text collections, summarization, and automatic detection of thematic structure.” There are some interesting examples of citation browsing tools like the Butterfly Citation Browser here.
