Evidence for chemical evolution in the spectra of high redshift galaxies D. Mehlert, S. Noll, I. Appenzeller, R. P. Saglia, R. Bender, A. Böhm, N. Drory, K. Fricke, A. Gabasch, J. Heidt et al. (6 more) A&A, 393 3 (2002) 809-819 Published online: 01 October 2002 DOI: 10.1051/0004-6361:20021052