Columbia subject headings:
Zaĭt︠s︡ev, Boris, 1881-1972--Criticism and interpretation--Congresses.
Harvard subject headings:
Zaĭt︠s︡ev, Boris, 1881-1972--Criticism and interpretation--Congresses.
Princeton subject headings:
Zaĭt︠s︡ev, Boris, 1881-1972--Criticism and interpretation--Congresses.