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- [6] SPECTROPHOTOMETRY OF NUCLEI OF PLANETARY NEBULAE SOVIET ASTRONOMY AJ USSR, 1966, 9 (05): : 800 - &
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- [8] PHOTOELECTRIC SPECTROPHOTOMETRY OF PLANETARY NEBULAE ASTROPHYSICAL JOURNAL, 1954, 120 (01): : 48 - 57
- [10] PHOTOELECTRIC SPECTROPHOTOMETRY OF PLANETARY NEBULAE ASTRONOMICAL JOURNAL, 1954, 59 (05): : 187 - 187