TY - JOUR AU - Langa, Jose A. AU - Suárez, Antonio TI - Pullback permanence for non-autonomous partial differential equations JO - Electronic Journal of Differential Equations PY - 2002 VL - 2002 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/EJDE_2002__2002__a102/ LA - en ID - EJDE_2002__2002__a102 ER -