%0 Journal Article
%A Ayyad, Youssef
%A Sofonea, Mircea
%T Analysis of two dynamic frictionless contact problems for elastic-viscoplastic materials
%J Electronic Journal of Differential Equations
%D 2007
%V 2007
%I mathdoc
%U http://geodesic.mathdoc.fr/item/EJDE_2007__2007__a163/
%G en
%F EJDE_2007__2007__a163