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Иш: Nuclear activity of NGC 5548 from UBVRI observations during 1990–2000
Flicker of extragalactic radio sources at two frequencies
J. H. Simonetti, J. M. Cordes, D. S. Heeschen
Мақола19859 иқтибосABIStars observed photoelectrically near quasars and related objects
M. J. Penston, M. V. Penston, Allan Sandage
Мақола19713 иқтибосABI