@conference {997,
	title = {Item selection in computerized adaptive testing: improving the a-stratified design with the Sympson-Hetter algorithm},
	booktitle = {Paper presented at the Annual Meeting of the American Educational Research Association},
	year = {1999},
	address = {Montreal, CA},
	author = {Leung, C-K.. and Chang, Hua-Hua and Hau, K-T.}
}
