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Additional information
Byurakan Astrophysical Observatory. Translated from Astrofizika, Vol. 11, No. 2, pp. 207–220, April–June, 1975.
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Saakyan, K.A., Khachikyan, É.E. One form of activity in galaxies. Astrophysics 11, 136–145 (1975). https://doi.org/10.1007/BF01002447
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DOI: https://doi.org/10.1007/BF01002447