Karachentsev, I.D.; Kashibadze, O.G. (2006). «Masses of the local group and of the M81 group estimated from distortions in the local velocity field». Astrophysics49 (1): 3-18. doi:10.1007/s10511-006-0002-6. Bibcode: 2006Ap.....49....3K.
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.
Karachentsev, I.D.; Kashibadze, O.G. (2006). «Masses of the local group and of the M81 group estimated from distortions in the local velocity field». Astrophysics49 (1): 3-18. doi:10.1007/s10511-006-0002-6. Bibcode: 2006Ap.....49....3K.
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.