3Kleinberg J.Bursty and hierarchical structure in streams.Proceedings of Proceedings of the 8th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining(pp.91-101),Edmonton,Alberta,Canada:ACM Press,2002.
4Freeman L C.Centrality in social networks:Conceptual clarification.Social Networks,1979,1:215-239.
5Price D D.Networks of scientific papers.Science,1965,149:510-515.
6van Raan A.On growth,ageing,and fractal differentiation of science.Scientometrics,2000,47(2):347-362.
7Abt H A.Why some papers have long citation lifetimes.Nature,1998,395:756-757.
9Chen C,Morris S.Visualizing evolving networks:Minimum spanning trees versus pathfinder networks.Proceedings of IEEE Symposium on Information Visualization(pp.67-74),Seattle,Washington:IEEE Computer Society Press,2003.
10Small H G,Griffith B C.The structure of scientific literatures i:Identifying and graphing specialties.Science Studies,1974,4:17-40.
