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- [24] IONIZATION STRUCTURE AND COMPOSITION OF PLANETARY NEBULA NGC-7027 ASTROPHYSICAL JOURNAL, 1978, 219 (02): : 565 - 574
- [25] 3D structure of the planetary nebula NGC 7027 ASYMMETRICAL PLANETARY NEBULAE III, 2004, 313 : 119 - 122
- [27] STUDY OF PLANETARY NEBULA NGC 1360 AND OF ITS CENTRAL STAR ASTRONOMICHESKII ZHURNAL, 1973, 50 (03): : 501 - 507
- [28] Physical structure of planetary nebulae. I. The Owl Nebula ASTRONOMICAL JOURNAL, 2003, 125 (06): : 3213 - 3221
- [29] Surface VRI photometry and the structure of the "dusty" galaxy NGC 972 ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS, 1998, 24 (05): : 584 - 593
- [30] Photometry of the globular cluster NGC 3201 and its variable stars ASTRONOMICAL JOURNAL, 2003, 125 (01): : 208 - 223