@inproceedings{KDD-2009-ShiZCZ,
	author        = "Xiaolin Shi and Jun Zhu and Rui Cai and Lei Zhang",
	booktitle     = "{Proceedings of the 15th International Conference on Knowledge Discovery and Data Mining}",
	doi           = "10.1145/1557019.1557105",
	isbn          = "978-1-60558-495-9",
	pages         = "777--786",
	publisher     = "{ACM}",
	title         = "{User grouping behavior in online forums}",
	year          = 2009,
}