Spectral analysis of sdB stars from the Hamburg Quasar Survey H. Edelmann, U. Heber, H.-J. Hagen, M. Lemke, S. Dreizler, R. Napiwotzki and D. Engels A&A, 400 3 (2003) 939-950 Published online: 07 March 2003 DOI: 10.1051/0004-6361:20030135