@article{10_4064_ap_65_2_157_161,
     author = {Christoph Schmoeger},
     title = {On the norm-closure of the class of hypercyclic operators},
     journal = {Annales Polonici Mathematici},
     pages = {157--161},
     publisher = {mathdoc},
     volume = {65},
     number = {2},
     year = {1996},
     doi = {10.4064/ap-65-2-157-161},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-65-2-157-161/}
}