Improved photometric calibration of the SNLS and the SDSS supernova surveys M. Betoule, J. Marriner, N. Regnault, J.-C. Cuillandre, P. Astier, J. Guy, C. Balland, P. El Hage, D. Hardin, R. Kessler et al. (6 more) A&A, 552 (2013) A124 Published online: 15 April 2013 DOI: 10.1051/0004-6361/201220610