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Translated fromAstrofizika, Vol. 36, No. 2 pp. 189–193, April–June, 1993.
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Israelyan, G.L., Nikogosyan, A.G. Spectral variability of P Cyg. Astrophysics 36, 119–121 (1993). https://doi.org/10.1007/BF01006294
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DOI: https://doi.org/10.1007/BF01006294