@article{10_21136_CPM_1990_108370,
     author = {Medkov\'a, Dagmar},
     title = {Invariance of the {Fredholm} radius of the {Neumann} operator},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {147--164},
     year = {1990},
     volume = {115},
     number = {2},
     doi = {10.21136/CPM.1990.108370},
     mrnumber = {1054002},
     zbl = {0707.35049},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1990.108370/}
}