R. Ramakrishnan and J. Gehrke, Database Management Systems, 2000.

I. Stoica, R. Morris, D. Karger, M. Kaashoek, and H. Balakrishnan, Chord: A Scalable Peerto-Peer Lookup service for Internet Applications, In: ACM SIGCOMM, pp.149-160, 2001.

N. Antonopoulos, J. Salter, and R. Peel, Amulti-ringmethodforefficient multi-dimensional data lookup in p2p networks, Proceedings of the 1st International Conference on Scalable Information Systems, 2006.

A. Avramidis, P. Kotzanikolaou, and C. Douligeris, Chord-PKI: Embedding a Public Key Infrastructure into the Chord Overlay Network Public Key Infrastructure, pp.978-981, 2007.

L. Liquori, C. Tedeschi, and F. Bongiovanni, Babelchord: a social tower of DHT-based overlay networks, 2009 IEEE Symposium on Computers and Communications, 2009.
DOI : 10.1109/ISCC.2009.5202345
URL : https://hal.archives-ouvertes.fr/hal-00909550

E. J. Lu, Y. Huang, and S. Lu, ML-Chord: A multi-layered P2P resource sharing model, Journal of Network and Computer Applications, vol.32, issue.3, pp.578-588, 2009.
DOI : 10.1016/j.jnca.2008.08.002

Z. Ognjanovi´cognjanovi´c, T. Butigan-vu?aj, and B. Marinkovi´cmarinkovi´c, NCD Recommendation for the National Standard for Describing Digitized Heritage in Serbia, Metadata and Semantics, pp.978-978, 2009.