TY  - JOUR
AU  - Ayyad,  Youssef
AU  - Sofonea,  Mircea
TI  - Analysis of two dynamic frictionless contact problems for elastic-viscoplastic materials
JO  - Electronic journal of differential equations
PY  - 2007
VL  - 2007
UR  - http://geodesic.mathdoc.fr/item/EJDE_2007__2007__a263/
LA  - en
ID  - EJDE_2007__2007__a263
ER  -