1. Multiple regression: Testing and interpreting interaction;Aiken,1991
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3. EQUATE 2.0: A computer program for the test characteristic curve method of IRT equating. User manual;Baker,1994
4. Homework does not belong on the agenda for educational reform;Barber;Educational Leadership,1986
5. Leistungsentwicklung und Ausgleich von Leistungsunterschieden in Gymnasialklassen [Development of achievement and leveling of achievement differences in Gymnasium classes];Baumert;Zeitschrift für Pädagogik,1986