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1991A&A...252..538K - Astronomy and Astrophysics, volume 252, 538-540 (1991)
A turned-over optical spectrum of OJ 287 during the 1989 minimum.
KIDGER M.R., TAKALO L.O., VALTAOJA E., DE DIEGO J.A. and SILLANPAA A.
Journal keyword(s):
Simbad objects: 1
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