Mixed Alkali Effect in Na2O-Li2O-Si O2 Glasses Studied by Isothermal Mechanical Spectroscopy C. Tardif, L. Arnault et A. RivièreJ. Phys. IV France, 06 C8 (1996) C8-711-C8-714DOI: https://doi.org/10.1051/jp4:19968155