%0 Journal Article %A Christoph Schmoeger %T On the norm-closure of the class of hypercyclic operators %J Annales Polonici Mathematici %D 1996 %P 157-161 %V 65 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-65-2-157-161/ %R 10.4064/ap-65-2-157-161 %G en %F 10_4064_ap_65_2_157_161