@incollection{Sonnentag2021,
  author    = {Michael Sonnentag},
  title     = {Artikel 90 Vorrang vor anderen {\"U}bereink{\"u}nften},
  booktitle = {CISG : Beck-online.GROSSKOMMENTAR : Zivilrecht},
  edition   = {Stand: 01.01.2021},
  editor    = {Wolfgang Ball},
  year      = {2021},
}