@book{GraebschBurkhardt2014,
  author    = {Graebsch, Christine M. and Burkhardt, Sven-Uwe},
  title     = {Ambulant sanctions as an alternative to imprisonment in the European Union?},
  publisher = {Center for the Study of Democracy},
  address   = {Sofia},
  isbn      = {978-954-477-220-8},
  pages     = {120},
  year      = {2014},
  language  = {en}
}
@book{GraebschBurkhardt2015,
  author    = {Graebsch, Christine M. and Burkhardt, Sven-Uwe},
  title     = {Vergleichsweise menschlich?},
  publisher = {Springer},
  address   = {Wiesbaden},
  isbn      = {978-3-658-08965-8},
  pages     = {XV, 144},
  year      = {2015},
  language  = {de}
}