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1977
de Gruijter, D. N. M. (1977). A two-stage testing procedure (Memorandum 403-77). University of Leyden, The Netherlands, Educational Research Center.
1988
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.