Ê Bekaert, J., Balakireva, L. ,Hochstenbach,P., Van de Sompel, H. (2004). Using MPEG-21 DIP and NISO OpenURL for the Dynamic Dissemination of Complex Digital Objects in the Los Alamos National Laboratory Digital Library. D-Lib Magazine 10, no. 3.
This paper focuses on the use of NISO OpenURL and MPEG-21 Digital Item Processing (DIP) to disseminate complex objects. It can be found online.
Hunter, J. (2001). Adding Multimedia to the Semantic Web - Building an MPEG-7 Ontology. In Proceedings of the First Semantic Web Working Symposium (SWWS), pages 261 -- 281.
The MPEG-21 framework is building on past standards set forth by the group. The incorporation of metadata is part of the intiative, and is a proposed extension of MPEG-7. The above paper addresses the issue of how to express the metadata content of this standard, and the paper can be found here.
International Standards Organization. (2002). MPEG-21 Overview v.5. In Jan Bormans, Keith Hill ed. ISO/IEC JTC1/SC29/WG11/N5231 (Technical Report).
The above technical report lays out the plan for the MPEG-21 standard. It gives both a review of what has been accomplished as well as an overview of the various parts of this multimedia framework. It can be found here.
Rightscom Limited (2003). MPEG-21 Rights Expression Language: A White Paper. online.
This paper discusses the Rights Expression Language aspect of the MPEG-21 standard. This part of the project is a language to declare rights and permissions using specific syntax and semantics. It is defined by Rights Data Dictionary.
As this proposed standard is largely an abstraction at this point, there are few official publications which can be cited. However, much information exists in the form of online powerpoint-type presentations. Examples can be found here, here and here.