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de Gruijter, D. N. M. (1988). The Rasch model and missing data, with an emphasis on tailoring test items. In annual meeting of the American Educational Research Association. presented at the April 5-9, New Orleans, LA. USA.
de Gruijter, D. N. M. (1977). A two-stage testing procedure (Memorandum 403-77). University of Leyden, The Netherlands, Educational Research Center.