Columbia subject headings:
Harvard subject headings:
ASCA (Artificial satellite)--Congresses.
Galaxies--Spectra--Congresses.
Space plasmas--Congresses.
X-ray astronomy--Congresses
Princeton subject headings:
ASCA (Artificial Satellite)--Congresses.
Galaxies--Spectra--Congresses.
Space plasmas--Congresses.
X-ray astronomy--Congresses.