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Leningrad State University. Translated from Astrofizika, Vol. 30, No. 1, pp. 7–14, January–February, 1989.
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Belov, V.N., Gagen-Torn, V.A. & Marchenko, S.G. Connection between the variability of BL Lac in the radio and optical ranges. Astrophysics 30, 1–6 (1989). https://doi.org/10.1007/BF01004080
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DOI: https://doi.org/10.1007/BF01004080