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Carbon, nitrogen and oxygen abundances have been found from the recombination lines for 63 planetary nebulae.
Golovatyj, V.V., Sapar, A.A., Feklistova, T. Kh., Kholtygin, A.F. (1991), Atomic data for the spectroscopy of rarefied astrophysical plasma, Tartu Astr. Obs. Teated No 109, TallinnGoogle Scholar