@article{SiepmannBalzerHechtetal.1999,
  author    = {Gerda Siepmann and Hans-Ulrich Balzer and Karl Hecht and Karin Salzberg-Ludwig},
  title     = {A disturbance of the circadian thythm or natural activation/deactivation regulation? : a pilot study on a 8- year-old children},
  year      = {1999},
}