Columbia subject headings:
Disks (Astrophysics)--Congresses.
Galaxies--Congresses.
Harvard subject headings:
Disks (Astrophysics)--Congresses.
Galaxies--Congresses
Princeton subject headings:
Barred galaxies--Congresses.
Disks (Astrophysics)--Congresses.
Galaxies--Congresses.