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1986BAAS...18Z.907S - Bull. American Astron. Soc., 18, 907 (1986)
EXOSAT observations of two AGNs : PHL 5200 and MK 509.
SCHNOPPER H.W., SINGH K.P. and WESTERGAARD N.J.
Journal keyword(s):
Simbad objects: 2
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