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Additional information
Byurakan Astrophysical Observatory. Translated from Astrofizika, Vol. 15, No. 3, pp. 461–472, July–September, 1979.
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Gurzadyan, G.A. Emission lines of Mg II and Ca II in planetary nebulae. Astrophysics 15, 310–316 (1979). https://doi.org/10.1007/BF01004376
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DOI: https://doi.org/10.1007/BF01004376