INTRINSICALLY BROKEN CHALCOGEN CHEMICAL ORDER IN STOICHIOMETRIC GLASSES W.J. Bresser, P. Boolchand, P. Suranyi and J.P. de Neufville J. Phys. Colloques, 42 C4 (1981) C4-193-C4-196 DOI: 10.1051/jphyscol:1981439