STRUCTURE OF SODIUM ALUMINOSILICATE GLASSES : X-RAY PHOTOELECTRON SPECTROSCOPY G.W. Tasker, D.R. Uhlmann, P.I.K. Onorato, M.N. Alexander and C.W. Struck J. Phys. Colloques, 46 C8 (1985) C8-273-C8-280 DOI: 10.1051/jphyscol:1985840