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- [27] THE IUE SPECTRUM OF THE PLANETARY-NEBULA NGC-6751 ASTROPHYSICAL JOURNAL, 1995, 448 (02): : 766 - 773
- [28] The ISO-SWS spectrum of planetary nebula NGC 7027 Astronomy and Astrophysics, 2001, 367 (03): : 949 - 958
- [29] The ISO-SWS spectrum of planetary nebula NGC 7027 ASTRONOMY & ASTROPHYSICS, 2001, 367 (03): : 949 - 958