@article{SiepmannBalzerHechtetal.1999,
  author    = {Siepmann, Gerda and Balzer, Hans-Ulrich and Hecht, Karl and Salzberg-Ludwig, Karin},
  title     = {A disturbance of the circadian thythm or natural activation/deactivation regulation? : a pilot study on a 8- year-old children},
  year      = {1999},
  language  = {en}
}
@misc{SiepmannSalzbergLudwig2004,
  author    = {Siepmann, Gerda and Salzberg-Ludwig, Karin},
  title     = {Research project to the subject},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-6502},
  year      = {2004},
  language  = {en}
}