Low frequency elastic properties of neutron-irradiated quartz. Comparison with glasses J. Classen, I. Rohr, C. Enss, S. Hunklinger and C. Laermans Eur. Phys. J. B, 10 4 (1999) 623-633 Published online: 15 August 1999 DOI: 10.1007/s100510050894