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Heller, Kurt A. and Neber, H. and Wystrychowski, W. (1993): Statewide Acceleration Program for Highly Gifted Students from the German Gymnasium. A Longitudanal Follow-up Evaluative Study (1991-2000). 10th World Congress on Gifted and Talented Education, 08.-13.08.1993, Toronto, Canada.
Heller, Kurt A. and Neber, H. (1994): Evaluationsstudie zur BundesSchülerAkademie 1993. Bericht an das Bundesministerium für Bildung und Wissenschaft (BMBW). Bonn: BMBW