R.I. 271 H. EL FEKIH et T. HADHRI SUR LA DETERMINATION DE LA CHARGE LIMITE D'UNE STRUCTURE ELASTOPLASTIQUE EN CONTRAINTES PLANES The whole paper is available as a compressed Postscript file by internet procedure FTP anonymous on host barbes.polytechnique.fr ( 129.104.4.100) in the directory pub/RI/1993 under the name fekih_hadhri.271.jan.93.ps.gz