Columbia subject headings:
Stars--Clusters--Evolution--Congresses.
Stars--Clusters--Formation--Congresses.
Harvard subject headings:
Galaxies--Evolution--Congresses
Stars
Stars--Clusters--Congresses
Stars--Evolution--Congresses
Stars--Formation--Congresses
Stars--Globular clusters--Congresses.
Princeton subject headings:
Stars--Clusters--Evolution--Congresses.
Stars--Clusters--Formation--Congresses.