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