Identification of extra neutral gauge bosons at the International Linear Collider P. Osland, A. A. Pankov and A. V. Tsytrinov Eur. Phys. J. C, 67 1-2 (2010) 191-204 Published online: 02 March 2010 DOI: 10.1140/epjc/s10052-010-1272-z