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«. Astrophysics. Zv. 49, št. 1. str. 3–18. Bibcode:2006Ap.....49....3K. doi:10.1007/s10511-006-0002-6.
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«. Astrophysics. Zv. 49, št. 1. str. 3–18. Bibcode:2006Ap.....49....3K. doi:10.1007/s10511-006-0002-6.