Citation
Kovalev Y. Y. , Kovalev Yu A. , Nizhelsky N. A. Bogdantsov A. B. (2002) Broad-Band Radio Spectra Variability of 550 AGN in 1997-2001. Publications of the Astronomical Society of Australia 19, 83-87.
https://doi.org/10.1071/AS01109
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