BEHAVIOUR OF GERMANIUM IN PHASE SEPARABLE GLASSES OF THE SYSTEM Na2O - B2O3 - GeO2 - SiO2 F. Gauthier, C. Lapeyre et J. Gombert J. Phys. Colloques, 43 C9 (1982) C9-253-C9-256 DOI: 10.1051/jphyscol:1982946