SNLS spectroscopy: testing for evolution in type Ia supernovae T. J. Bronder, I. M. Hook, P. Astier, D. Balam, C. Balland, S. Basa, R. G. Carlberg, A. Conley, D. Fouchez, J. Guy et al. (12 more) A&A, 477 3 (2008) 717-734 Published online: 28 August 2007 DOI: 10.1051/0004-6361:20077655