NTT and NOT spectroscopy of SDSS-II supernovae L. Östman, J. Nordin, A. Goobar, R. Amanullah, M. Smith, J. Sollerman, V. Stanishev, M. D. Stritzinger, B. A. Bassett, T. M. Davis et al. (11 more) A&A, 526 (2011) A28 Published online: 16 December 2010 DOI: 10.1051/0004-6361/201015704