Karachentsev, I. D.; Kashibadze, O. G.: Masses of the local group and of the M81 group estimated from distortions in the local velocity field. In: Astrophysics. 49. Jahrgang, Nr.1, 2006, S.3–18, doi:10.1007/s10511-006-0002-6, bibcode:2006Ap.....49....3K.
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Karachentsev, I. D.; Kashibadze, O. G.: Masses of the local group and of the M81 group estimated from distortions in the local velocity field. In: Astrophysics. 49. Jahrgang, Nr.1, 2006, S.3–18, doi:10.1007/s10511-006-0002-6, bibcode:2006Ap.....49....3K.