- Publication venue
- KIT-Bibliothek, Karlsruhe
- Publication date
- 25/01/1999
- Field of study
- Publication venue
- Max-Planck-Institut für Bildungsforschung
- Publication date
- 01/01/1982
- Field of study
- Publication venue
- Ludwig-Maximilians-Universität München
- Publication date
- 28/01/2009
- Field of study