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Additional information
P. K. Shternberg State Astronomical Institute. Translated from Astrofizika, Vol. 11, No. 2, pp. 249–259, April–June, 1975.
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Noskova, R.I. Spectrum of planetary nebula IC 4997 in the near infrared region. Astrophysics 11, 169–175 (1975). https://doi.org/10.1007/BF01002451
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DOI: https://doi.org/10.1007/BF01002451