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1982ApJ...258...53H - Astrophys. J., 258, 53-58 (1982)
CCD photometry of Markarian 421 and 501.
HICKSON P., FAHLMAN G.G., AUMAN J.R., WALKER G.A.H., MENON T.K. and NINKOV Z.
Journal keyword(s):
Simbad objects: 2
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