Effect of oxygen deficiency on the radiation sensitivity of sol-gel Ge-doped amorphous SiO2 S. Agnello, A. Alessi, F. M. Gelardi, R. Boscaino, A. Parlato, S. Grandi and A. Magistris Eur. Phys. J. B, 61 1 (2008) 25-31 Published online: 18 January 2008 DOI: 10.1140/epjb/e2008-00025-1