ALKALI FLUORIDE CONTAINING ZrF4 - BASED GLASSES : ELECTRICAL PROPERTIES AND NMR INVESTIGATION D. Ravaine, W. G. Perera et M. MinierJ. Phys. Colloques, 43 C9 (1982) C9-407-C9-410DOI: https://doi.org/10.1051/jphyscol:1982978