Bruce,
After reconsidering my previous response about clustering, I realized
that grouping by author might be a subcluster within the larger cluster
of a particular list (e.g., a document might have a Bibliography that
contains works not cited as well as a Works Cited list), and within an
author cluster the documents might be clustered by 'work'. Thus a
multi-level clustering functionality would be required to support the GUI.
Martha
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