@article{CMUC_1990_31_2_a23,
     author = {Medkov\'a, Dagmar},
     title = {On the convergence of {Neumann} series for noncompact operators},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {403},
     year = {1990},
     volume = {31},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1990_31_2_a23/}
}