Columbia subject headings:
Jurisdiction--European Union countries.
Jurisdiction--Germany.
Jurisdiction--United States.
Ultra vires--European Union countries.
Ultra vires--Germany.
Ultra vires--United States.
Harvard subject headings:
Jurisdiction--European Union countries.
Jurisdiction--Germany.
Jurisdiction--United States.
Ultra vires--European Union countries.
Ultra vires--Germany.
Ultra vires--United States.
Princeton subject headings: