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- [2] THE DEPENDENCE OF THE 8-13 MICRON SPECTRUM OF NGC-7027 ON POSITION IN THE NEBULA ASTROPHYSICAL JOURNAL, 1980, 242 (01): : 141 - 148
- [3] MOLECULAR-HYDROGEN AND THE 2 MICRON SPECTRUM OF NGC-7027 ASTROPHYSICAL JOURNAL, 1981, 244 (03): : 835 - 843
- [4] THE INTERPRETATION OF THE SPECTRUM OF NGC-7027 ASTROPHYSICAL JOURNAL, 1956, 124 (01): : 110 - 115