6Yule, G. U. A Mathematical Theory of Evolution, based on the Conclusions of Dr. J. C. Willis, F.R.S. [J]. Philosophical Transactions of the Royal Society of London (Series. B), 1925, (213):2187.
7Price, D. J. de S. A general theory of bibliometric and other cumulative advantage processes[J]. Journal of American Society of Information Science, 1976,(27): 292-306.
8Barabasi, A.,& Albert, R. Emergence of scaling in random networks[J]. Science, 1999,(286):509-512.
9Pennock, D.M., Flake, G.W., Lawrence, S., et al. Winners don' t take all: characterizing the competition for links on the web [J]. Proceedings of the National Academy of Sciences, 2002,99 (8):5207-5211.
10Price D. J. S. Networks of Scientific Papers[J]. Science ,1965, 149(3683) :510-515.
