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Additional information
Byurakan Astrophysical Observatory. Central Institute of Astrophysics, Academy of Sciences of the German Democratic Republic. Translated from Astrofizika, Vol. 10, No. 2, pp. 295–296, April–June, 1974.
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Kalloglyan, A.T., Börngen, F. Close system of blue galaxies. Astrophysics 10, 175–176 (1974). https://doi.org/10.1007/BF01006139
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DOI: https://doi.org/10.1007/BF01006139