Columbia subject headings:
Harvard subject headings:
Language and culture--Germany--Congresses.
Negation (Logic) in literature--Congresses.
Negativity (Philosophy)--Congresses.
Princeton subject headings:
German language--Negatives.
Grammar, Comparative and general--Negatives.
Language and culture--Germany--Congresses.
Negation (Logic)--In literature--Congresses.
Negativity (Philosophy)--Congresses.