@article{10_21136_CMJ_1965_100686,
     author = {Kr\'al, Josef},
     title = {The {Fredholm} radius of an operator in potential theory},
     journal = {Czechoslovak Mathematical Journal},
     pages = {454--473},
     publisher = {mathdoc},
     volume = {15},
     number = {3},
     year = {1965},
     doi = {10.21136/CMJ.1965.100686},
     mrnumber = {0190363},
     zbl = {0145.37003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1965.100686/}
}