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  -