Absolute stellar proper motions with reference to galaxies of the M 81 groupM. Odenkirchen, P. Brosche, F. Börngen, H. Meusinger and R. ZienerAstron. Astrophys. Suppl. Ser., 124 1 (1997) 189-196DOI: https://doi.org/10.1051/aas:1997189