This presentation: http://metalab.unc.edu/xml/slides/nypc/jdom/
JavaWorld: http://javaworld.com/javaworld/jw-05-2000/jw-0518-jdom.html
Java and XML, Brett McLaughlin, O'Reilly & Associates, 2000, ISBN 0-596-00016-2, http://www.oreilly.com/catalog/javaxml/