Columbia subject headings:
Planetary theory--Congresses.
Planets--Origin--Congresses.
Harvard subject headings:
Astrophysics--Congresses
Disks (Astronomy)--Congresses.
Planets--Origin--Congresses.
Solar system--Origin--Congresses.
Stars--Evolution--Congresses
Princeton subject headings:
Planetary theory--Congresses.
Planets--Origin--Congresses.