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Additional information
Byurakan Astrophysical Observatory. Translated from Astrofizika, Vol. 8, No. 1, pp. 17–31, January–March, 1972.
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Kazaryan, M.A., Khachikyan, É.E. Spectrophotometric investigation of the cometary nebula NGC 2261. Astrophysics 8, 8–16 (1972). https://doi.org/10.1007/BF01003102
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DOI: https://doi.org/10.1007/BF01003102