@inbook{P106.037, author={De Keukelaere, Frederik and Van de Walle, Rik }, title={Digital Item Declaration and Identification}, booktitle={The MPEG-21 Book}, year={2006}, month={1}, pages={69 - 116}, editor={Burnett, I. and Pereira, F. and Van de Walle, R. and Koenen, R.}, publisher={Wiley}, address={West Sussex}, }