@article {761,
	title = {Can examinees use judgments of item difficulty to improve proficiency estimates on computerized adaptive vocabulary tests? },
	journal = {Journal of Educational Measurement},
	volume = {39},
	year = {2002},
	pages = { 311-330},
	author = {Vispoel, W. P. and Clough, S. J. and Bleiler, T. and Hendrickson, A. B. and Ihrig, D.}
}
