@article {Cui_03:Query,
	title = {Query expansion by mining user logs},
	journal = {IEEE Transactions on Knowledge and Data Engineering},
	volume = {15(4)},
	year = {2003},
	pages = {829-839},
	author = {H. Cui and J-R. Wen and Jian-Yun Nie and W-Y. Ma}
}
