Wedgebox analysis of four-lepton events from neutralino pair production at the LHC G. Bian, M. Bisset, N. Kersting, Y. Liu and X. Wang Eur. Phys. J. C, 53 3 (2008) 429-446 Published online: 04 December 2007 DOI: 10.1140/epjc/s10052-007-0472-7