Influence of acceptor impurities on semi-insulating GaAs particle detectors R. Ferrini, G. Guizzetti, M. Patrini, F. Nava, P. Vanni and C. Lanzieri Eur. Phys. J. B, 16 2 (2000) 213-216 Published online: 15 July 2000 DOI: 10.1007/s100510070221