Precise radial velocities of giant stars - I. Stable stars S. Hekker, S. Reffert, A. Quirrenbach, D. S. Mitchell, D. A. Fischer, G. W. Marcy and R. P. Butler A&A, 454 3 (2006) 943-949 Published online: 17 July 2006 DOI: 10.1051/0004-6361:20064946