The spectroscopic binaries 21 Her and γ Gem H. Lehmann, S. M. Andrievsky, I. Egorova, G. Hildebrandt, S. A. Korotin, K. P. Panov, G. Scholz and D. Schönberner A&A, 383 2 (2002) 558-567 Published online: 15 February 2002 DOI: 10.1051/0004-6361:20011746