Columbia subject headings:
Celestial mechanics--Congresses.
Many-body problem--Congresses.
Two-body problem--Congresses.
Harvard subject headings:
Celestial mechanics--Congresses
Many-body problem--Congresses.
Two-body problem--Congresses.
Princeton subject headings:
Celestial mechanics--Congresses.
Many-body problem--Congresses.
Two-body problem--Congresses.