B. M. Peterson, L. Ferrarese, K. M. Gilbert et et al., «Central Masses and Broad-Line Region Sizes of Active Galactic Nuclei. II. A Homogeneous Analysis of a Large Reverberation-Mapping Database», The Astrophysical Journal, vol.613, no2, , p.682-699 (DOI10.1086/423269, Bibcode2004ApJ...613..682P, lire en ligne[PDF])
Jong-Hak Woo et Urry, «ACTIVE GALACTIC NUCLEUS BLACK HOLE MASSES AND BOLOMETRIC LUMINOSITIES», The Astrophysical Journal, vol.579, , p.46 pages (lire en ligne[PDF])
B. M. Peterson, L. Ferrarese, K. M. Gilbert et et al., «Central Masses and Broad-Line Region Sizes of Active Galactic Nuclei. II. A Homogeneous Analysis of a Large Reverberation-Mapping Database», The Astrophysical Journal, vol.613, no2, , p.682-699 (DOI10.1086/423269, Bibcode2004ApJ...613..682P, lire en ligne[PDF])
Abraham Mahtessian, «Groups of galaxies. III. Some empirical characteristics», Astrophysics, vol.41, no3, , p.308-321 (DOI10.1007/BF03036100, lire en ligne, consulté le ).
B. M. Peterson, L. Ferrarese, K. M. Gilbert et et al., «Central Masses and Broad-Line Region Sizes of Active Galactic Nuclei. II. A Homogeneous Analysis of a Large Reverberation-Mapping Database», The Astrophysical Journal, vol.613, no2, , p.682-699 (DOI10.1086/423269, Bibcode2004ApJ...613..682P, lire en ligne[PDF])
Abraham Mahtessian, «Groups of galaxies. III. Some empirical characteristics», Astrophysics, vol.41, no3, , p.308-321 (DOI10.1007/BF03036100, lire en ligne, consulté le ).