Columbia subject headings:
Graph theory--Congresses.
Social problems--Mathematical models--Congresses.
Social sciences--Mathematical models--Congresses.
Harvard subject headings:
Graph theory--Congresses
Social problems--Mathematical models--Congresses.
Social sciences--Mathematical models--Congresses
Princeton subject headings:
Graph theory--Congresses.
Social problems--Mathematical models--Congresses.
Social sciences--Mathematical models--Congresses.