R. J. Rand; S. R. Kulkarni; J. J. Hester (1992). «Warm ionized gas in the edge-on galaxies NGC 4565 and NGC 4631». Astrophysical Journal396: 97–103. doi:10.1086/171699. Bibcode: 1992ApJ...396...97R.
G. J. Bendo; D. A. Dale; B. T. Draine; C. W. Engelbracht και άλλοι. (2006). «The Spectral Energy Distribution of Dust Emission in the Edge-on Spiral Galaxy NGC 4631 as Seen with Spitzer and the James Clerk Maxwell Telescope». Astrophysical Journal652 (1): 283–305. doi:10.1086/508057. Bibcode: 2006ApJ...652..283B.
Q. D. Wang; S. Immler; R. Walterbos; J. T. Lauroesch και άλλοι. (2001). «Chandra Detection of a Hot Gaseous Corona around the Edge-on Galaxy NGC 4631». Astrophysical Journal555 (2): L99–L102. doi:10.1086/323179. Bibcode: 2001ApJ...555L..99W.
Q. D. Wang; R. A. S. Walterbos; M. F. Steakley; C. A. Norman και άλλοι. (1994). «ROSAT detection of diffuse hot gas in the edge-on galaxy NGC 4631». Astrophysical Journal439: 176–184. doi:10.1086/175162. Bibcode: 1995ApJ...439..176W.
G. Giuricin; C. Marinoni; L. Ceriani; A. Pisani (2000). «Nearby Optical Galaxies: Selection of the Sample and Identification of Groups». Astrophysical Journal543 (1): 178–194. doi:10.1086/317070. Bibcode: 2000ApJ...543..178G.
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R. J. Rand; S. R. Kulkarni; J. J. Hester (1992). «Warm ionized gas in the edge-on galaxies NGC 4565 and NGC 4631». Astrophysical Journal396: 97–103. doi:10.1086/171699. Bibcode: 1992ApJ...396...97R.
G. J. Bendo; D. A. Dale; B. T. Draine; C. W. Engelbracht και άλλοι. (2006). «The Spectral Energy Distribution of Dust Emission in the Edge-on Spiral Galaxy NGC 4631 as Seen with Spitzer and the James Clerk Maxwell Telescope». Astrophysical Journal652 (1): 283–305. doi:10.1086/508057. Bibcode: 2006ApJ...652..283B.
Q. D. Wang; S. Immler; R. Walterbos; J. T. Lauroesch και άλλοι. (2001). «Chandra Detection of a Hot Gaseous Corona around the Edge-on Galaxy NGC 4631». Astrophysical Journal555 (2): L99–L102. doi:10.1086/323179. Bibcode: 2001ApJ...555L..99W.
Q. D. Wang; R. A. S. Walterbos; M. F. Steakley; C. A. Norman και άλλοι. (1994). «ROSAT detection of diffuse hot gas in the edge-on galaxy NGC 4631». Astrophysical Journal439: 176–184. doi:10.1086/175162. Bibcode: 1995ApJ...439..176W.
P. Fouque; E. Gourgoulhon; P. Chamaraux; G. Paturel (1992). «Groups of galaxies within 80 Mpc. II - The catalogue of groups and group members». Astronomy and Astrophysics Supplement93: 211–233. Bibcode: 1992A&AS...93..211F.
A. M. Garcia (1993). «General study of group membership. II - Determination of nearby groups». Astronomy and Astrophysics Supplement100: 47–90. Bibcode: 1993A&AS..100...47G.
G. Giuricin; C. Marinoni; L. Ceriani; A. Pisani (2000). «Nearby Optical Galaxies: Selection of the Sample and Identification of Groups». Astrophysical Journal543 (1): 178–194. doi:10.1086/317070. Bibcode: 2000ApJ...543..178G.