@conference {1213,
	title = {Constraining item exposure in computerized adaptive testing with shadow tests},
	booktitle = {Paper presented at the Annual meeting of the National Council on Measurement in Education},
	year = {2003},
	note = {$\#$vdLI03-02},
	address = {Chicago IL},
	author = {van der Linden, W. J. and Veldkamp, B. P.}
}
