P. Gill, M. Arlitt, Z. Li, and A. Mahanti, Youtube traffic characterization, Proceedings of the 7th ACM SIGCOMM conference on Internet measurement , IMC '07, 2007.
DOI : 10.1145/1298306.1298310

X. Cheng, C. Dale, and J. Liu, Statistics and Social Network of YouTube, IWQoS 2008. 16th International Workshop on Videos, Quality of Service, 2008.

F. Duarte, F. Benevenuto, V. Almeida, and J. Almeida, Geographical Characterization of YouTube: a Latin American View', Web Conference, pp.13-21, 2007.