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van Hoof, Peter A. M.; Van de Steene, Griet C.; Beintema, Douwe A.; Martin, P. G.; Pottasch, Stuart R.; Ferland, Gary J. (20 March 2000). "Properties of Dust Grains in Planetary Nebulae. I. The Ionized Region of NGC 6445". The Astrophysical Journal. 532 (1): 384–399. arXiv:astro-ph/9910400. Bibcode:2000ApJ...532..384V. doi:10.1086/308536. S2CID14603253.
Perinotto, M. (June 1991). "Chemical abundances in planetary nebulae - Basic data and correlations between elements". The Astrophysical Journal Supplement Series. 76: 687. Bibcode:1991ApJS...76..687P. doi:10.1086/191578.
van Hoof, Peter A. M.; Van de Steene, Griet C.; Beintema, Douwe A.; Martin, P. G.; Pottasch, Stuart R.; Ferland, Gary J. (20 March 2000). "Properties of Dust Grains in Planetary Nebulae. I. The Ionized Region of NGC 6445". The Astrophysical Journal. 532 (1): 384–399. arXiv:astro-ph/9910400. Bibcode:2000ApJ...532..384V. doi:10.1086/308536. S2CID14603253.
van Hoof, Peter A. M.; Van de Steene, Griet C.; Beintema, Douwe A.; Martin, P. G.; Pottasch, Stuart R.; Ferland, Gary J. (20 March 2000). "Properties of Dust Grains in Planetary Nebulae. I. The Ionized Region of NGC 6445". The Astrophysical Journal. 532 (1): 384–399. arXiv:astro-ph/9910400. Bibcode:2000ApJ...532..384V. doi:10.1086/308536. S2CID14603253.