Aberer, K., Alima, L. O., Ghodsi, A., Girdzijauskas, S., Haridi, S. & Hauswirth, M. (2005). The essence of P2P: A reference architecture for overlay networks. Proc. of the Fifth IEEE International Conference on Peer-to-Peer Computing, "Use of Computers at the Edge of Networks (P2P, Grid, Clusters)", August 31 - September 2, .