@phdthesis{Rietsch2013,
  author      = {Katrin Rietsch},
  title       = {Body composition especially external skeletal robustness in association with physical activity and recreation in pre-pubertal children : a national and international investigation},
  type        = {doctoralthesis},
  school      = {Universit{\"a}t Potsdam},
  year        = {2013},
}