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1981SvA....25...56N - Sov. Astron., 25, 56-58 (1981)
Emission-line spectra and the abundance of carbon and nitrogen ions in planetary nebulae.
NIKITIN A.A., SAPAR A.A., FEKLISTOVA T.K. and KHOLTYGIN A.F.
Journal keyword(s):
Simbad objects: 7
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