SWS spectra of both NGC 7027 and NGC 6543 are the subject of the ISO dedicated Astronomy and Astrophysics Letter;
"The central stars of the planetary nebulae NGC 7027 and NGC 6543", D.A. Beintema et al.
In the same issue, an LWS grating spectrum of NGC7027 is presented in the letter;
"The ISO LWS grating spectrum of NGC7027", X.-W. Liu et al.
NGC 7027 is discussed in the ESA Bulletin article (no. 86);
NGC 6543 was also discussed in the item "Different Impressions of a Dying Star" that appeared in the ESA press release;
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