Columbia subject headings:
Xenopoulos, Grēgorios, 1867-1951--Criticism and interpretation--Congresses.
Harvard subject headings:
Xenopoulos, Grēgorios, 1867-1951--Criticism and interpretation--Congresses.
Princeton subject headings:
Xenopoulos, Grēgorios, 1867-1951--Criticism and interpretation--Congresses.