6M. Efron. Information Search and Retrieval in Microb- logs[J]. Journal of the American Society for Informa- tion Science and Technology, 2011, 62(6): 996-1008.
7L. Tang, H. Liu. Leveraging Social Media Networks for Classification[J]. Data Mining and Knowledge Discov- ery, 2011,23(3): 447-448.
8Z. Xiang, U. Gretzel. Role of Social Media in Online Travel Information Search[J]. Tourism Management, 2010, 31(2): 179-188.
9R. Pastor-Satorras, A. Vespignani. Epidemic Spreading in Scale-free Networks[J]. Physical Review Letters, 2001, 86 (14): 3200-3203.
10R. Pastor-Satorras, A. Vespignani. Epidemic Dynamics and Endemic States in Complex Networks[J]. Physical Review E, 2001, 63(6): 325-346.