1. L. A.Adamic, Zipf, power-laws, and pareto-a ranking tutorial, Xerox Palo Alto Research Center, Palo Alto, CA, http://www.hpl.hp.com/research/idl/papers/ranking/ranking.html.
2. Mechanisms in cardiovascular diseases: How useful are medical textbooks, emedicine, and youtube?;Azer;Advances in Physiology Education,2014
3. YouTube: Online video and participatory culture;Burgess,2013
4. I tube, you tube, everybody tubes: Analyzing the world's largest user generated content video system;Cha,2007
5. Statistics and social network of youtube videos;Cheng,2008