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Additional information
Astrofizika, Vol. 1, No. 4, pp. 417–428, 1965
Byurakan Astrophysical Observatory
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Khachikyan, E.E., Parsamyan, E.S. Colorimetric investigation of the cometary nebula anon 6h04m . Astrophysics 1, 221–227 (1965). https://doi.org/10.1007/BF01042822
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DOI: https://doi.org/10.1007/BF01042822