@article {song2009identification,
	title = {Identification of ambiguous queries in web search},
	journal = {Information Processing \& Management},
	volume = {45},
	number = {2},
	year = {2009},
	pages = {216{\textendash}229},
	publisher = {Elsevier},
	author = {Song, Ruihua and Luo, Zhenxiao and Jian-Yun Nie and Yu, Yong and Hon, Hsiao-Wuen}
}
