EXISTENCE OF A GAP IN THE LOW ENERGY DENSITY OF STATES OF VITREOUS SILICA J. C. Lasjaunias, R. Maynard et M. VandorpeJ. Phys. Colloques, 39 C6 (1978) C6-973-C6-975DOI: https://doi.org/10.1051/jphyscol:19786431