Columbia subject headings:
Galaxies--Evolution--Congresses.
Galaxies--Formation--Congresses.
Stars--Evolution--Congresses.
Harvard subject headings:
Cosmology--Congresses.
Galaxies--Evolution--Congresses
Galaxies--Formation--Congresses
Stars--Congresses
Stars--Evolution--Congresses
Princeton subject headings:
Galaxies--Evolution--Congresses.
Galaxies--Formation--Congresses.
Stars--Evolution--Congresses.