@book{Petersen2013,
  author    = {Petersen, Jens},
  title     = {Examinatorium Allgemeiner Teil des BGB und Handelsrecht},
  publisher = {de Gruyter},
  address   = {Berlin},
  isbn      = {978-3-11-024800-5},
  doi       = {10.1515/9783110248012},
  pages     = {490 S.},
  year      = {2013},
  language  = {de}
}
@book{Petersen2013,
  author    = {Petersen, Jens},
  title     = {Examens-Repetitorium Allgemeines Schuldrecht},
  series = {Unirep Jura},
  journal   = {Unirep Jura},
  edition   = {6., neu bearb.},
  publisher = {M{\"u}ller},
  address   = {Heidelberg, Hamburg},
  isbn      = {978-3-8114-9333-9},
  pages     = {211 S.},
  year      = {2013},
  language  = {de}
}