@conference {1258,
	title = {Adaptation of a-stratified method in variable length computerized adaptive testing},
	booktitle = {Paper presented at the annual meeting of the American Educational Research Association},
	year = {2001},
	note = {{PDF file, 384 KB}},
	address = {Seattle WA},
	author = {Wen, J.-B. and Chang, Hua-Hua and Hau, K.-T.~}
}
