Spectroscopy of twelve type Ia supernovae at intermediate redshift C. Balland, M. Mouchet, R. Pain, N. A. Walton, R. Amanullah, P. Astier, R. S. Ellis, S. Fabbro, A. Goobar, D. Hardin et al. (8 more) A&A, 445 2 (2006) 387-402 Published online: 16 December 2005 DOI: 10.1051/0004-6361:20053552