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byurakan Astrophysical Observatory. Translated from Astrofizika, Vol. 21, No. 5, pp. 289–294, September–October, 1984.
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Tovmasyan, G.G. Spectral classes of the cold components of U Gem type stars. Astrophysics 21, 507–510 (1984). https://doi.org/10.1007/BF01813655
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DOI: https://doi.org/10.1007/BF01813655