@article {2128,
	title = {A closer look at using judgments of item difficulty to change answers on computerized adaptive tests},
	journal = {Journal of Educational Measurement},
	volume = {42},
	number = {4},
	year = {2005},
	pages = {331-350},
	author = {Vispoel, W. P. and Clough, S. J. and Bleiler, T.}
}
