Variability of fast neutron yield in underground environment A. Borio di Tigliole, E. Calligarich, A. Cesana, R. Dolfini, L. Garlati, A. Giuliani, M. Pedretti, A. Rappoldi, G. L. Raselli and M. Terrani Europhys. Lett., 67 6 (2004) 1045-1049 Published online: 01 September 2004 DOI: 10.1209/epl/i2004-10137-2