Columbia subject headings:
Negotiorum gestio--Germany (West)
Obligations (Law)--Germany (West)
Torts--Germany (West)
Unjust enrichment--Germany (West)
Harvard subject headings:
Negotiorum gestio--Germany (West)
Obligations (Law)--Germany (West)
Torts--Germany (West)
Unjust enrichment--Germany (West)
Princeton subject headings: