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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 1, pp. 104–105, January, 2012.
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Likhushin, Y.B., Smirnov, A.I. A SDSS black quasar. Russ Phys J 55, 240–241 (2012). https://doi.org/10.1007/s11182-012-9801-x
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DOI: https://doi.org/10.1007/s11182-012-9801-x