@book{KuepperGrabow2011,
  author    = {K{\"u}pper, Georg and Grabow, Stefan},
  title     = {Die sukzessive Qualifikation von Raub und r{\"a}uberischer Erpressung},
  isbn      = {3-8114-5428-5},
  year      = {2011},
  language  = {de}
}
@phdthesis{Grabow2013,
  author    = {Grabow, Stefan},
  title     = {Die Sicherungserpressung},
  series = {Schriften zum Strafrecht},
  volume    = {240},
  journal   = {Schriften zum Strafrecht},
  publisher = {Duncker \& Humblot},
  address   = {Berlin},
  isbn      = {978-3-428-14027-5},
  doi       = {10.3790/978-3-428-54027-3},
  pages     = {276 S.},
  year      = {2013},
  language  = {de}
}