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Additional information
Byurakan Astrophysical Observatory. Translated from Astrofizka, Vol. 9, No. 4, pp. 503–508, October–December, 1973.
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Iskudaryan, S.G. Color — Absolute-magnitude relation for the nuclei of normal spirals. Astrophysics 9, 305–307 (1973). https://doi.org/10.1007/BF01002514
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DOI: https://doi.org/10.1007/BF01002514