Columbia subject headings:
Art, European--20th century--Exhibitions.
Art, European--Exhibitions.
Avant-garde (Aesthetics)--Europe--Exhibitions.
Harvard subject headings:
Art, European--20th century--Exhibitions
Art, Modern--20th century--Europe--Exhibitions.
Avant-garde (Aesthetics)--Europe--Exhibitions.
Zero (Group of artists)
Princeton subject headings: