R. E. White, III, W. C. Keel, C. J. Conselice (2000). "Seeing Galaxies through Thick and Thin. I. Optical Opacity Measures in Overlapping Galaxies". Astrophysical Journal. 542 (2): 761–778. Bibcode:2000ApJ...542..761W. doi:10.1086/317011.Pemeliharaan CS1: Banyak nama: authors list (link)
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R. E. White, III, W. C. Keel, C. J. Conselice (2000). "Seeing Galaxies through Thick and Thin. I. Optical Opacity Measures in Overlapping Galaxies". Astrophysical Journal. 542 (2): 761–778. Bibcode:2000ApJ...542..761W. doi:10.1086/317011.Pemeliharaan CS1: Banyak nama: authors list (link)