%0 Journal Article %A D. van Dulst %T Perturbation theory and strictly singular operators in locally convex spaces %J Studia Mathematica %D 1970 %P 341-372 %V 38 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-38-1-341-372/ %R 10.4064/sm-38-1-341-372 %G en %F 10_4064_sm_38_1_341_372