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. (2000). Lagrangian relaxation for constrained curve-fitting with binary variables: Applications in educational testing. Dissertation Abstracts International Section A: Humanities and Social Sciences, 61, 1063.
. (2002). A comparison of item selection techniques and exposure control mechanisms in CATs using the generalized partial credit model. Applied Psychological Measurement, 26, 147-163.
. (2003). A Bayesian method for the detection of item preknowledge in computerized adaptive testing. Applied Psychological Measurement, 27, 121-137.
. (2003). Optimal stratification of item pools in α-stratified computerized adaptive testing. Applied Psychological Measurement, 27, 262-274.