Pair creation supernovae at low and high redshift N. Langer, C. A. Norman, A. de Koter, J. S. Vink, M. Cantiello and S.-C. Yoon A&A, 475 2 (2007) L19-L23 Published online: 02 October 2007 DOI: 10.1051/0004-6361:20078482