TY - JOUR AU - Nickel, Gregor TI - A new look at boundary perturbations of generators JO - Electronic Journal of Differential Equations PY - 2004 VL - 2004 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/EJDE_2004__2004__a130/ LA - en ID - EJDE_2004__2004__a130 ER -