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Additional information
A. A. Zhdanov Leningrad State University. Translated from Astrofizika, Vol. 13, No. 4, pp.569–586, October–December, 1977.
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Hagen-Thorn, V.A., Voshchinnikov, N.V. Polarimetric investigation of the nebula NGC 6618 and the neighboring stars. Astrophysics 13, 337–347 (1977). https://doi.org/10.1007/BF01006609
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DOI: https://doi.org/10.1007/BF01006609