IBIS Veto System - Background rejection, instrument dead time and zoning performance E. M. Quadrini, A. Bazzano, A. J. Bird, K. Broenstad, F. Di Marco, G. La Rosa, M. Michalska, P. Orleanski, A. Solberg and P. Ubertini A&A, 411 1 (2003) L153-L157 Published online: 17 November 2003 DOI: 10.1051/0004-6361:20031259