@inbook{47454,
  author       = {{Kämpfe, Astrid and Kehne, Miriam}},
  booktitle    = {{Moving People, Moving Forward}},
  pages        = {{502--534}},
  publisher    = {{Limerick: UL}},
  title        = {{{Measuring physical activity of children - Development of a new self-report questionaire}}},
  year         = {{2011}},
}