TY - JOUR AU - E. El Haddad AU - R. Deville TI - The Viscosity Subdifferential of the Sum of Two Functions in Banach Spaces. I: First Order Case JO - Journal of convex analysis PY - 1996 SP - 295 EP - 308 VL - 3 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/JCA_1996_3_2_a8/ ID - JCA_1996_3_2_a8 ER -