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Additional information
Fesenkov Astrophysical Institute, Academy of Sciences of Kazakhstan. Translated from Astrofizika, Vol. 36, No. 1, pp. 67–72, January–February, 1993.
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Kondrat'eva, A.N. Fast evolutionary variations in the spectrum of object Th 4-4. Astrophysics 36, 37–40 (1993). https://doi.org/10.1007/BF01005634
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DOI: https://doi.org/10.1007/BF01005634