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. (2003). A comparative study of item exposure control methods in computerized adaptive testing. Journal of Educational Measurement, 40, 71-103.
. (1998). A comparative study of item exposure control methods in computerized adaptive testing. Research Report Series 98-3, Iowa City: American College Testing.
. (1998). A comparative study of item exposure control methods in computerized adaptive testing. Unpublished doctoral dissertation, University of Iowa , Iowa City IA.