Optical variability of the NLS1 galaxy Ark 564 in 1987–2004

Author： Doroshenko V. Sergeev S. Gaskell C. Golubinskii Yu. Klimek E. Sergeeva E.

ISSN： 1063-7729

Source： Astronomy Reports, Vol.50, Iss.9, 2006-09, pp. : 708-713

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