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Additional information
Astrofizika, Vol. 4, No. 3, pp. 385–408, 1968
Byurakan Astrophysical Observatory
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Iskudaryan, S.G. The nuclei of Sc galaxies. Astrophysics 4, 151–162 (1968). https://doi.org/10.1007/BF01087502
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DOI: https://doi.org/10.1007/BF01087502