Measurement of the atmospheric muon charge ratio with the OPERA detector N. Agafonova, A. Anokhina, S. Aoki, A. Ariga, T. Ariga, D. Autiero, A. Badertscher, A. Bagulya, A. Bertolin, M. Besnier et al. (174 more) Eur. Phys. J. C, 67 1-2 (2010) 25-37 Published online: 23 March 2010 DOI: 10.1140/epjc/s10052-010-1284-8