The Following text was taken from the ESA Science site: URL: http://isowww.estec.esa.nl/science/
SWS spectra showing the spectral energy distribution of the planetary nebulae NGC 7027 and NGC 6543 in the infra-red
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.
INFRARED PROCESSING AND ANALYSIS CENTER