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- [36] PLANETARY-NEBULAE IN LOCAL GROUP GALAXIES .1. IDENTIFICATIONS IN NGC 185, NGC 205, AND NGC 221 ASTROPHYSICAL JOURNAL, 1973, 183 (02): : L73 - &
- [37] MOLECULES IN NGC-6781 AND OTHER RINGLIKE PLANETARY-NEBULAE ASTROPHYSICAL JOURNAL, 1990, 356 (02): : L59 - &
- [38] A new look at carbon abundances in planetary nebulae .2. BB 1, NGC, NGC 1535, NGC 2440, and NGC 7027 ASTROPHYSICAL JOURNAL, 1996, 473 (01): : 304 - 309
- [39] THE RADIAL-VELOCITIES OF PLANETARY-NEBULAE IN NGC-3379 ASTROPHYSICAL JOURNAL, 1993, 414 (02): : 454 - 462