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1991AJ....101...71X - Astron. J., 101, 71-77 (1991)
Observational distinction between two types of active galactic nuclei.
XIE G.Z., LIU F.K., LIU B.F., LI K.H., LU R.W. and LU J.F.
Journal keyword(s):
CDS comments: PKS 1510-89 misprint for PKS 1510-089
Simbad objects: 67
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