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- [43] The ISO LWS grating spectrum of NGC 7027 ASTRONOMY & ASTROPHYSICS, 1996, 315 (02): : L257 - L260
- [44] Dust extinction and elemental abundances of NGC 7027 PLANETARY NEBULAE: THEIR EVOLUTION AND ROLE IN THE UNIVERSE, 2003, (209): : 319 - 320
- [45] THE COMPOSITION OF THE PLANETARY NEBULA NGC-7027 ASTROPHYSICAL JOURNAL, 1954, 120 (03): : 401 - 412
- [46] IDENTIFICATION OF THE CENTRAL STAR OF NGC-7027 ASTROPHYSICAL JOURNAL, 1988, 333 (01): : 193 - &