TY  - JOUR
A1  - Siepmann, Gerda
A1  - Balzer, Hans-Ulrich
A1  - Hecht, Karl
A1  - Salzberg-Ludwig, Karin
T1  - A disturbance of the circadian thythm or natural activation/deactivation regulation? : a pilot study on a 8- year-old children
Y1  - 1999
ER  - 
TY  - GEN
A1  - Salzberg-Ludwig, Karin
T1  - Scholarly research on mind maps in learning by mentally retarded children
Y1  - 2008
UR  - http://www.leeds.ac.uk/educol/documents/174867.pdf
ER  -