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- [4] THE PHOTOELECTRIC PHOTOMETRY OF PLANETARY NEBULAE ASTROPHYSICAL JOURNAL, 1955, 122 (02): : 240 - 255
- [5] THE PHOTOELECTRIC PHOTOMETRY OF 18 PLANETARY NEBULAE ASTRONOMICAL JOURNAL, 1954, 59 (05): : 186 - 187
- [6] PHOTOELECTRIC PHOTOMETRY OF FAINT GASEOUS NEBULAE ASTRONOMICAL JOURNAL, 1955, 60 (05): : 167 - 167
- [7] PHOTOELECTRIC FILTER PHOTOMETRY OF PLANETARY-NEBULAE ASTROPHYSICAL JOURNAL, 1976, 210 (01): : 113 - 119
- [8] PHOTOELECTRIC PHOTOMETRY OF PLANETARY NEBULAE .3. ASTROPHYSICAL JOURNAL, 1963, 138 (01): : 293 - &