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- [16] PHOTOIONIZATION MODELS OF LUMINESCENCE AND PHYSICAL CHARACTERISTICS OF PLANETARY-NEBULAE - BD+30-DEGREES-3639 AND NGC-7293 ASTRONOMICHESKII ZHURNAL, 1991, 68 (06): : 1197 - 1210
- [18] ASTROMETRY WITH THE HUBBLE SPACE TELESCOPE: TRIGONOMETRIC PARALLAXES OF PLANETARY NEBULA NUCLEI NGC 6853, NGC 7293, ABELL 31, AND DeHt 5 ASTRONOMICAL JOURNAL, 2009, 138 (06): : 1969 - 1984