J. L. Tonry; A. Dressler; J. P. Blakeslee; E. A. Ajhar και άλλοι. (2001). «The SBF Survey of Galaxy Distances. IV. SBF Magnitudes, Colors, and Distances». Astrophysical Journal546 (2): 681–693. doi:10.1086/318301. Bibcode: 2001ApJ...546..681T.
J. L. Tonry; A. Dressler; J. P. Blakeslee; E. A. Ajhar και άλλοι. (2001). «The SBF Survey of Galaxy Distances. IV. SBF Magnitudes, Colors, and Distances». Astrophysical Journal546 (2): 681–693. doi:10.1086/318301. Bibcode: 2001ApJ...546..681T.