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Astrofizika, Vol. 4, No. 1, pp. 41–57, 1968
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Saakyan, K.A. Central condensations in Sb galaxies. Astrophysics 4, 17–25 (1968). https://doi.org/10.1007/BF01013154
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DOI: https://doi.org/10.1007/BF01013154