@conference {1238,
	title = {Relative precision of ability estimation in polytomous CAT: A comparison under the generalized partial credit model and graded response model},
	booktitle = {Paper presented at the annual meeting of the American Educational Research Association},
	year = {2002},
	note = {$\#$WA02-01 {PDF file, 735 KB}},
	address = {New Orleans LA},
	author = {Wang, S and Wang, T.}
}
@article {786,
	title = {Reducing bias in CAT trait estimation: A comparison of approaches},
	journal = {Applied Psychological Measurement},
	volume = {23},
	year = {1999},
	pages = {263-278},
	author = {Wang, T. and Hanson, B. H. and C.-M. H. Lau}
}
