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Glas, C. A. W., & Veerkamp, W. J. J.. (1999). Item calibration and parameter drift. In . W. J. van der Linden and C. A. W. Glas (Eds.), Computer adaptive testing: Theory and practice. Norwell MA: Kluwer.
Berger, M. P. F.,, & Veerkamp, W. J. J.. (1997). Some new item selection criteria for adaptive testing. Journal of Educational and Behavioral Statistics, 22, 203-226.
Veerkamp, W. J. J. (1997). Statistical methods for computerized adaptive testing. Unpublished doctoral dissertation, University of Twente, Enschede, The Netherlands.