• Ron Daniel, Jr. & Carl Lagoze, "Extending the Warwick Framework: From Metadata Containers to Active Digital Objects", D-Lib Magazine, 3(11), 1997.
  http://www.dlib.org/dlib/november97/daniel/11daniel.html

• Naomi Dushay, "Localizing Experience of Digital Content via Structural Metadata", Proceedings of JCDL 2002.
  http://doi.acm.org/10.1145/544220.544274
  http://arxiv.org/ftp/cs/papers/0112/0112017.pdf

• Michael L. Nelson & Kurt Maly, "Smart Objects and Open Archives", D-Lib Magazine 7(2), 2001.
  http://www.dlib.org/dlib/february01/nelson/02nelson.html