@book{HeinzeSteinroetter2023,
  author    = {Christian Heinze and Bj{\"o}rn Steinr{\"o}tter},
  title     = {\S\S 327-327u},
  edition   = {Neubearbeitung 2023},
  series    = {Vertr{\"a}ge {\"u}ber digitale Produkte},
  volume    = {2},
  isbn      = {978-3-8059-1341-6},
  year      = {2023},
}