1. Learning potential and educability among the educable mentally retarded.;Budoff,1973
2. The development of a learning potential measure based on Raven's Progressive Matrices;Budoff,1971
3. Humburger Neurotizismus und Extraversionsskala für Kinder und Jugendliche;Buggle,1972
4. Modes of presentation of the Raven Coloured Progressive Matrices Test: Toward a differential testing approach;Carlson;Trierer Psychologische Berichte,1976
5. Der Effekt von Problemverbalisation bei verschiedenen Aufgabengruppen und Darbietungsformen des “Raven Progressive Matrices Test”;Carlson;Diagnostica,1974