@booklet {1438,
	title = {Development and evaluation of online calibration procedures (TCN 96-216)},
	year = {1998},
	address = {Champaign IL: Algorithm Design and Measurement Services, Inc},
	author = {Levine, M. L. and Williams.}
}
@conference {1006,
	title = {Maintaining a CAT item pool with operational data},
	booktitle = {Paper presented at the annual meeting of the National Council on Measurement in Education},
	year = {1997},
	address = {Chicago IL},
	author = {Levine, M. L. and Segall, D. O. and Williams, B. A.}
}
