J. L. Tonry؛ A. Dressler؛ J. P. Blakeslee؛ E. A. Ajhar؛ وآخرون (2001). "The SBF Survey of Galaxy Distances. IV. SBF Magnitudes, Colors, and Distances". Astrophysical Journal. ج. 546 ع. 2: 681–693. arXiv:astro-ph/0011223. Bibcode:2001ApJ...546..681T. DOI:10.1086/318301.
L. C. Ho؛ A. V. Filippenko؛ W. L. W. Sargent (1997). "A Search for "Dwarf" Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies". Astrophysical Journal Supplement. ج. 112 ع. 2: 315–390. arXiv:astro-ph/9704107. Bibcode:1997ApJS..112..315H. DOI:10.1086/313041.
Graham، Alister W. (نوفمبر 2008)، "Populating the Galaxy Velocity Dispersion - Supermassive Black Hole Mass Diagram: A Catalogue of (Mbh, σ) Values"، Publications of the Astronomical Society of Australia، ج. 25، ص. 167–175، arXiv:0807.2549، Bibcode:2008PASA...25..167G، DOI:10.1071/AS08013.
J. L. Tonry؛ A. Dressler؛ J. P. Blakeslee؛ E. A. Ajhar؛ وآخرون (2001). "The SBF Survey of Galaxy Distances. IV. SBF Magnitudes, Colors, and Distances". Astrophysical Journal. ج. 546 ع. 2: 681–693. arXiv:astro-ph/0011223. Bibcode:2001ApJ...546..681T. DOI:10.1086/318301.
L. C. Ho؛ A. V. Filippenko؛ W. L. W. Sargent (1997). "A Search for "Dwarf" Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies". Astrophysical Journal Supplement. ج. 112 ع. 2: 315–390. arXiv:astro-ph/9704107. Bibcode:1997ApJS..112..315H. DOI:10.1086/313041.
Graham، Alister W. (نوفمبر 2008)، "Populating the Galaxy Velocity Dispersion - Supermassive Black Hole Mass Diagram: A Catalogue of (Mbh, σ) Values"، Publications of the Astronomical Society of Australia، ج. 25، ص. 167–175، arXiv:0807.2549، Bibcode:2008PASA...25..167G، DOI:10.1071/AS08013.
A. F. Tennant؛ R. F. Mushotzky (1983). "The absence of rapid X-ray variability in active galaxies". Astrophysical Journal. ج. 264: 92–104. Bibcode:1983ApJ...264...92T. DOI:10.1086/160576.
A. Ptak؛ T. Yaqoob؛ P. J. Serlemitsos؛ R. Mushotzky؛ وآخرون (1994). "Rapid X-ray spectral variability in NGC 3227". Astrophysical Journal. ج. 436: L31–L34. Bibcode:1994ApJ...436L..31P. DOI:10.1086/187626.
J. L. Tonry؛ A. Dressler؛ J. P. Blakeslee؛ E. A. Ajhar؛ وآخرون (2001). "The SBF Survey of Galaxy Distances. IV. SBF Magnitudes, Colors, and Distances". Astrophysical Journal. ج. 546 ع. 2: 681–693. arXiv:astro-ph/0011223. Bibcode:2001ApJ...546..681T. DOI:10.1086/318301.
L. C. Ho؛ A. V. Filippenko؛ W. L. W. Sargent (1997). "A Search for "Dwarf" Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies". Astrophysical Journal Supplement. ج. 112 ع. 2: 315–390. arXiv:astro-ph/9704107. Bibcode:1997ApJS..112..315H. DOI:10.1086/313041.
Graham، Alister W. (نوفمبر 2008)، "Populating the Galaxy Velocity Dispersion - Supermassive Black Hole Mass Diagram: A Catalogue of (Mbh, σ) Values"، Publications of the Astronomical Society of Australia، ج. 25، ص. 167–175، arXiv:0807.2549، Bibcode:2008PASA...25..167G، DOI:10.1071/AS08013.
A. F. Tennant؛ R. F. Mushotzky (1983). "The absence of rapid X-ray variability in active galaxies". Astrophysical Journal. ج. 264: 92–104. Bibcode:1983ApJ...264...92T. DOI:10.1086/160576.
A. Ptak؛ T. Yaqoob؛ P. J. Serlemitsos؛ R. Mushotzky؛ وآخرون (1994). "Rapid X-ray spectral variability in NGC 3227". Astrophysical Journal. ج. 436: L31–L34. Bibcode:1994ApJ...436L..31P. DOI:10.1086/187626.