VACANCY-CATION DISTRIBUTION IN NON STOICHIOMETRIC LAYERED IRON-TITANIUM CHALCOGENIDES G.A. Fatséas, J.L. Dormann et M. Danot J. Phys. Colloques, 40 C2 (1979) C2-367-C2-372 DOI: 10.1051/jphyscol:19792130