%0 Journal Article %A Yu. M. Liberman %T On the type of the equations in the theory of plasticity %J Doklady Akademii Nauk %D 1957 %P 32-34 %V 116 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1957_116_1_a7/ %G ru %F DAN_1957_116_1_a7