Columbia subject headings:
Dix, Otto, 1891-1969--Criticism and interpretation.
Dix, Otto, 1891-1969--Exhibitions.
Harvard subject headings:
Dix, Otto, 1891-1969--Criticism and interpretation.
Dix, Otto, 1891-1969--Exhibitions.
Princeton subject headings:
Dix, Otto, 1891-1969--Criticism and interpretation.
Dix, Otto, 1891-1969--Exhibitions.