Columbia subject headings:
ROSAT (Artificial satellite)--Congresses.
X-ray astronomy--Congresses.
X-ray sources, Galactic--Congresses.
Harvard subject headings:
ROSAT (Artificial satellite)--Congresses.
X-ray astronomy--Congresses
X-ray sources, Galactic--Congresses.
Princeton subject headings:
ROSAT (Artificial satellite)--Congresses.
X-ray astronomy--Congresses.
X-ray sources, Galactic--Observations--Congresses.