@incollection{Sonnentag2021,
  author    = {Michael Sonnentag},
  title     = {Art. 21 EuErbVO Allgemeine Kollisionsnorm},
  booktitle = {Internationales Privatrecht und UN-Kaufrecht : Juris PraxisKommentar BGB},
  edition   = {9},
  editor    = {Markus W{\"u}rdinger},
  volume    = {6},
  isbn      = {978-3-86330-277-1},
  url       = {https://www.juris.de/perma?d=jpk-BGBPK6ISR0300},
  year      = {2021},
}