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- [21] SPECTROPHOTOMETRY OF THE PLANETARY NEBULA NGC-7027 ASTRONOMICAL JOURNAL, 1948, 53 (07): : 202 - 202
- [22] THE COMPOSITION OF THE PLANETARY NEBULA NGC-7027 ASTROPHYSICAL JOURNAL, 1954, 120 (03): : 401 - 412
- [23] Molecular line emission from the young planetary nebula NGC 7027 PLANETARY NEBULAE: THEIR EVOLUTION AND ROLE IN THE UNIVERSE, 2003, (209): : 272 - 272