@article {liu2012task,
	title = {Task difficulty and domain knowledge effects on information search behaviors},
	journal = {Proceedings of the American Society for Information Science and Technology},
	volume = {49},
	number = {1},
	year = {2012},
	pages = {1{\textendash}10},
	publisher = {Wiley Subscription Services, Inc., A Wiley Company Hoboken},
	author = {Chang Liu and Jingjing Liu and Cole, Michael and Belkin, Nicholas J. and Zhang, Xiangmin}
}
