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Additional information
Byurakan Astrophysical Observatory. Translated from Astrofizika, Vol. 7, No. 4, pp. 557–572, October–December, 1971.
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Ambartsumyan, V.A. Fuors. Astrophysics 7, 331–339 (1971). https://doi.org/10.1007/BF01003016
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DOI: https://doi.org/10.1007/BF01003016