@article{ZiegenhainDreisoernerDerksen1999,
  author    = {Ziegenhain, Ute and Dreis{\"o}rner, R. and Derksen, B.},
  title     = {Intervention bei jugendlichen M{\"u}ttern und ihren S{\"a}uglingen},
  issn      = {0941-5653},
  year      = {1999},
  language  = {de}
}
@article{ZiegenhainDreisoernerDerksen1999,
  author    = {Ziegenhain, Ute and Dreis{\"o}rner, R. and Derksen, B.},
  title     = {Intervention bei jugendlichen M{\"u}ttern},
  isbn      = {3-932133-88-9},
  year      = {1999},
  language  = {de}
}